Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8f63de1fbe6844…

MALICIOUS

PDF

63.2 KB Created: 2020-10-15 00:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: c7e7b9b99210db8803fc0845871b3c07 SHA-1: c575627bffded5f9748b854230c868693925d5b6 SHA-256: 5c8f63de1fbe6844caf4fdb1ea0e54efb5eeb6117e7416e88286a103684b4c8b
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to disposable hosting, and one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a book summary, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/strik?keyword=learning+how+to+learn+summary+pdf In PDF document text
    • https://site-1037085.mozfiles.com/files/1037085/85122957553.pdfIn PDF document text
    • https://site-1040322.mozfiles.com/files/1040322/45326791701.pdfIn PDF document text
    • https://site-1041084.mozfiles.com/files/1041084/gikomoxepura.pdfIn PDF document text
    • https://site-1039577.mozfiles.com/files/1039577/49866773214.pdfIn PDF document text
    • https://site-1042094.mozfiles.com/files/1042094/windows_7_ultimate_wallpaper_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f87671961496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5f87671c80e2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f870ca31d236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f874bdcf0986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f8766d6a8abd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f8726511f2a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f871801126fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f871262d909e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5f8767295d69e.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/bitopaweruxivel.pdfIn PDF document text
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/c25f730.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/1e5f44f77b.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/6662357.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/425b213c-0870-4635-94ca-3fe76df734ae/sofiwiramanijopoguvaketu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04965d24-a344-4c49-b8d4-d1e206f89d1a/rowedufetusalimip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/340248be-7d04-479e-968c-773378939c43/peneduviledukavavume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae4dfe82-e38d-4e4c-bd0a-b123ac6cf121/liwul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99b50ea0-4332-4fa8-ae12-272a4a745e6f/30013418987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e046c620-e8f3-4c5d-a332-52e6a78d878f/jerora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3862040a-7f4c-4847-8416-cfcb6e93c2aa/45339184985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a29398a5-e2a7-4e9f-be2c-d802f65aea85/77774060816.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000768c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x768C 9280 bytes
SHA-256: 6f03957302df8f4dc2bdf7c1f05dcbe1268c7c7fb89d9055625b1d25c70cbe3f
font_01_sfnt_off000094d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94D5 5472 bytes
SHA-256: adfec5d01ed650613744087f35adafcaddd4bf2240328109f9626fd93e9b1904
font_02_sfnt_off0000a75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA75A 10280 bytes
SHA-256: b9f10158efe9c15ce6620dde36a1ab8d6a6f92dedda2614c0b24633d66fd78c1
font_03_sfnt_off0000ca9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9F 16164 bytes
SHA-256: 0646a63a478fe53468b8dbbe05b608d617a04836cde27f490c8d0ce00ae8a9f2
font_04_sfnt_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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