Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b85d6351b1887c7…

MALICIOUS

PDF

42.8 KB Created: 2020-08-09 19:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e15ffe6ca34fa03cb7599a90cfa4dc4 SHA-1: 6ca1f0e38045222e2340a5d6c976e77882607386 SHA-256: 6b85d6351b1887c7e07726e20b96de83ba42c3472cc3ac787effd773757cece5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One prominent link, https://ttraff.ru/pify?keyword=braiding+machine+design+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure users to malicious infrastructure. No scripts were extracted, but the presence of numerous links and the identified malicious redirector strongly suggest a phishing or scam attempt.

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=braiding+machine+design+pdf
    • http://files.shaneproductions.com/uploads/1/3/2/6/132681391/gidabewarazu.pdf
    • http://files.sociallysquared.com.au/uploads/1/3/1/4/131483201/f36a52dcf.pdf
    • http://files.threeriversstudio.com/uploads/1/3/0/7/130776131/4e16d7e2b.pdf
    • http://files.adornkids.com/uploads/1/3/1/8/131856068/9648078e1ec.pdf
    • http://files.elizabethengstrom.com/uploads/1/3/1/4/131406173/tamogunex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/31821577112.pdf
    • https://cdn.shopify.com/s/files/1/0433/0985/8984/files/genobadifabal.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/98326180571.pdf
    • https://cdn.shopify.com/s/files/1/0431/5463/6949/files/ligadura_de_arteria_carotida_externa.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2546/files/aisin_clutch_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0435/4228/2394/files/questes_administrao_geral_e_pblica.pdf
    • https://cdn.shopify.com/s/files/1/0430/4781/3269/files/nodosexetelofelotixosola.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/futupinoxotederoxewol.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/bring_it_on_home_to_me.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/20493652592.pdf
    • https://cdn.shopify.com/s/files/1/0435/5679/8627/files/gejoxeroxusafalu.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_off00006720.bin
73afaee963897ce083a491b8fee5aaea6479b240194133852ef4c13b3ec4cfd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6720 5588 bytes
font_01_sfnt_off000079fc.bin
7be4eb8b6497598bd4752df481622289ca89df54d8d48cf3a78b891abfbde231		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79FC 10992 bytes

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