Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac569541db43de3…

MALICIOUS

PDF

41.6 KB Created: 2020-10-30 13:07:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 56c49904fef8bc96fea0396d3d80bfbc SHA-1: 35aaa32477703d064249f59baca1cf03c7f6a808 SHA-256: aac569541db43de36c1a874a05f24e0354287cf02f39f8359e72f3e2b50bc301
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://gettraff.ru/strik?keyword=blender+2.79+text+to+mesh'. This suggests the document is part of a link farm or phishing campaign designed to redirect users to malicious sites. The presence of many benign-looking PDF links further supports the SEO spam/link farm hypothesis, likely intended to drive traffic to the malicious redirector.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=blender+2.79+text+to+mesh In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_5f90ede22c564.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7961/2612/files/ximamofajivedupajojiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7111/8746/files/94103325225.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/basasiwujivab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c87f6d9c-ef49-41e0-bb86-04f0a757ea44/wuxilenew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3164/9689/files/vapofebanidasarelixajin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4654/2229/files/94214344683.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7299/5996/files/xivubugefedidojoraw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21db6033-c868-4421-af5c-bc1437869560/86129220806.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3232/9371/files/wogonipixunevazakegazo.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/rogizesi.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/22196641225.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_off000060fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60FC 5372 bytes
SHA-256: 2736934c91c9c1ddec25606057fac9a400150267a4c49d50f76538fa5a3c32bc
font_01_sfnt_off00007329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7329 11268 bytes
SHA-256: 84ab9143630ed5d07bd37bf642df749e6801d3d6ea927b797801a2ae16688128

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