Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b30c138d02a273…

MALICIOUS

PDF

40.8 KB Created: 2020-08-14 09:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 527c9eaeef56bb1343f0c5b23b6342f7 SHA-1: fffc315ffb00341be279323a662d72c36475b2f8 SHA-256: 13b30c138d02a27378974b070e0c40ef3e831519d9acb63c7de8669efa312596
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, but one critical link redirects to a known malicious domain, ttraff.ru. This indicates a link farm or redirection scheme designed to obscure the final malicious destination. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.ru/pify?keyword=beginners+guide+to+deep+sea+fishing
    • http://files.kerrycaffynart.com/uploads/1/3/0/7/130775242/1b26cb3be14264.pdf
    • http://files.corinnecook.me/uploads/1/3/1/1/131163953/fifovezobobudu.pdf
    • http://nilexa.preciousbeginnings.info/uploads/1/3/0/7/130739678/69ea75ceb.pdf
    • http://files.memorialcityhall.com/uploads/1/3/2/7/132741385/jevedafufew-badazap.pdf
    • http://tavupe.govindaincense.com/uploads/1/3/1/3/131384536/5871947.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0078/1208/files/taselawidibotenexi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/boduxan.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/2998/files/biperideno_bula_profissional.pdf
    • https://cdn.shopify.com/s/files/1/0433/9390/8892/files/19427407425.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6961/files/covert_rural_surveillance.pdf
    • https://cdn.shopify.com/s/files/1/0432/2079/5556/files/35900267198.pdf
    • https://cdn.shopify.com/s/files/1/0451/3293/9417/files/pufimi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofifarigomikidapowokov.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61238086127.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinubigelezegir.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4238/files/lurizuzetujewemikerifib.pdf
    • https://cdn.shopify.com/s/files/1/0435/0204/3288/files/77236695760.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006272.bin
c84c414ffb5ebe6b3304fcf6764ca3b27ab55d2b3ab98bcf0506aab8b7897876		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6272 5320 bytes
font_01_sfnt_off00007482.bin
7054445c4af6abe764ebda25cd51c42156536937d833ca203c6504331483c53c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7482 9908 bytes

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