Malicious PDF — malware analysis report

Static analysis result for SHA-256 745937e4918a1083…

MALICIOUS

PDF

39.3 KB Created: 2020-08-11 23:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e73e49afe09fab035dfc7c075faab4ec SHA-1: d3f3bef01f8a8dc7e2c3f46d6a9a97b2be8ecd5c SHA-256: 745937e4918a1083b88da87346ed36416c90d608e8d545577113ee424bd6447f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The primary malicious URL identified is `https://ttraff.com/wb?keyword=like%20and%20unlike%20terms%20worksheet`. While the document body is heavily obfuscated, the presence of many links, including those to potentially benign Shopify domains and other unknown domains, suggests a link farm or redirection scheme designed to lead users to malicious content. The ML classifier strongly supports the malicious verdict.

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.com/wb?keyword=like%20and%20unlike%20terms%20worksheet
    • http://files.ggspecialized.com/uploads/1/3/2/7/132740338/widuvivilemeb_jifelagawepise_rabajil_biniwagat.pdf
    • http://files.gittesatre.com/uploads/1/3/1/8/131857114/tamid-tufepupagu-lezanilisipo.pdf
    • http://jowulixov.brickandbaking.com/uploads/1/3/1/4/131438667/fekidobuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9065/6924/files/fe_mechanical_practice_exam_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/1876052972.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4826/files/53093109458.pdf
    • https://cdn.shopify.com/s/files/1/0429/2699/7663/files/kevusedojefi.pdf
    • https://cdn.shopify.com/s/files/1/0445/9390/5828/files/arihant_bank_po_reasoning.pdf
    • https://cdn.shopify.com/s/files/1/0429/3351/8489/files/alesis_dm5_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/9224/6685/files/el_alquimista_de_paulo_coelho.pdf
    • https://cdn.shopify.com/s/files/1/0433/0517/3147/files/bodumezag.pdf
    • https://cdn.shopify.com/s/files/1/0433/8122/7672/files/51228637712.pdf
    • https://cdn.shopify.com/s/files/1/0427/7318/4678/files/losik.pdf
    • https://cdn.shopify.com/s/files/1/0431/7813/1611/files/97020362746.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/95173244539.pdf
    • https://cdn.shopify.com/s/files/1/0436/9724/2280/files/kegepigid.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_off00005c73.bin
e15e4ed10edeffc64a682e98e801c58f9fbc83ce22f08460f240574da2dacb7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C73 5160 bytes
font_01_sfnt_off00006de3.bin
35a1a398a2020e752977062a6ef27911b1515cc02a92512901822f00039ff7b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE3 10116 bytes

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