Malicious PDF — malware analysis report

Static analysis result for SHA-256 881a10e7a91255d2…

MALICIOUS

PDF

69.9 KB Created: 2020-10-09 12:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 34b90e27eb035027d6009175fef19f48 SHA-1: e768fa257e1c866ebbbde357a61fce41b236edc9 SHA-256: 881a10e7a91255d29802b649d7141b2440e8ff0a23b009a5f35d915ff8ee7f3c
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=college+admissions+assistance In PDF document text
    • http://files.youngjerome.com/uploads/1/3/0/7/130739996/4256826.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/32235a12-1019-4672-a9ab-1590fd176422/80687127414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0308e79f-1bc5-4e41-92a8-74127a27542a/gawadegaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0c66980-7192-482f-a7f0-b1a108d10268/tazeda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3c949b5-e8fa-421c-b994-30e8460d6fc3/44653055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87da4359-1b1e-468b-ac0b-776cdf9498a5/51728398070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d53df876-8141-4f5c-b160-72e988bf0dcf/76409503602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83717522-9f4e-44f3-bf65-177964815f6a/13867448689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/614ca95b-e7bd-45f1-81d9-4d638758f106/jasegigixoroduwukone.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_off0000d739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 5068 bytes
SHA-256: c5bcec43735c8b7f3adf2dcf42162392480b788427befa4f3eff77ba70756c29
font_01_sfnt_off0000e866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE866 10148 bytes
SHA-256: c72af6733dbf62182c835a5a14820a98f30687b7567060e9c31e8d3c43810bf8