Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9d8e838501f14a…

MALICIOUS

PDF

57.1 KB Created: 2020-10-29 17:50:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 84bbf59440c41473fa532658c4adcc96 SHA-1: 895a22d7170eef2657e77962e461402512ddb3fd SHA-256: 1b9d8e838501f14a8e9787e122f9e63bb87a0ba42c9c87cbfb9b80703c153cc3
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating a phishing or scam attempt. The document body, though malformed, contains the target URL and text suggesting a lure for movie downloads. The presence of numerous external PDF links points to a link farm used for SEO manipulation or distributing malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=the+fifth+element+full+movie+download+720p In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5f89327d20278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415524/normal_5f99250d2396c.pdfIn PDF document text
    • https://fipaziditude.weebly.com/uploads/1/3/4/4/134465794/aa500454d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404285/normal_5f96382798b7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416327/normal_5f95e4860c245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368248/normal_5f94dc850dac8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5f89c6060174e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415754/normal_5f99f44d12490.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/1700446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_5f90815421bfa.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/96a04ec0-9361-4c81-b77a-f2a332688bee/25921661362.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/blood_relation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41e34d50-cb49-4c3e-95f7-e76b9c72dbea/theme_maker_chrome.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/barron_s_sat_2018_free_download.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000aa85.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAA85 26572 bytes
SHA-256: 95db1a9e0adbd8106dead6507edcf0a1cf976d5ddbcc8045312758544ae263ac
font_00_sfnt_off000073c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73C6 5464 bytes
SHA-256: 010534deb67097279a453ff06927960d69d0a659ab43dfb4246459d39f50e9a4
font_01_sfnt_off00008656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8656 10588 bytes
SHA-256: c0ed2ffedbf330397317c788aa0722c6eb36a83f96061d5b45befadbd8ff9fdb

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