Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7544b3ac4670d0…

MALICIOUS

PDF

46.4 KB Created: 2020-10-28 08:19:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3ed46700cdd6f5cfaf245a4798413e1c SHA-1: b8f1c47fa76cb7297913dfebeb25f43907098603 SHA-256: ef7544b3ac4670d09bac005888b4de74ab017cbd0bda74830e7d0d1a341cdce6
192 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and some redirecting to malicious infrastructure, indicating a link farm or phishing attempt. The presence of a 'download' button lure further supports this. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious workflow designed to lead users to download unwanted or harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://ttraff.cc/123?keyword=big+time+gangsta+mod+apk+android+download In PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/sulusilalope-jobede.pdfIn PDF document text
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/ralugurumos.pdfIn PDF document text
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/4994528.pdfIn PDF document text
    • https://dedaruxije.weebly.com/uploads/1/3/4/4/134455514/3576847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_5f8c642ac8c3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375509/normal_5f8a4bfe0a49d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393637/normal_5f8f014e2f552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_5f8cf064b1851.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/d22f9e168d13c.pdfIn PDF document text
    • https://veraweno.weebly.com/uploads/1/3/0/7/130739577/sitogimafefiwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5f96bcf600b22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367912/normal_5f887b53f161d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369507/normal_5f9895fae6d52.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00d9bfb-d349-4537-b3fa-425e852d115e/zepetapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c46197dc-6193-49ab-9a81-13ee72329b39/38276703540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d500b91-3cf0-4533-825a-5fa8d2b88406/goodman_y_gilman_12_edicion_desc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4596cc96-7597-4895-8d65-9a10553edb15/pijolaganisawenugoliputi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2aef352-8030-4e73-8e78-3160eabc27d1/vodamubenaxuxafetom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9940bdb-98a2-4e18-bd94-5c894f3192b0/mujolexapej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8152735a-e4e4-43e8-a86c-932baea63036/42296896600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a31272-3d6f-4e6e-94ee-5dec2b8f9024/dimefogiweselodelop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2dd96f6-4dbc-4aa8-93ba-728904156735/40131030367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b946f0c-0f8a-4b81-ac2b-1ff109c0a859/destiny_best_legendary_auto_rifle.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7213 5484 bytes
SHA-256: beb86d2aa97c3816ae55107f160506f671b1cae7f756683be4d4ccb8db9e1939
font_01_sfnt_off000084b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84B2 11600 bytes
SHA-256: 3028440dcf9b05886240cb68a0432fad27da2ba484928af045a621638257cd44