Malicious PDF — malware analysis report

Static analysis result for SHA-256 873f7f3632a8267d…

MALICIOUS

PDF

32.9 KB Created: 2020-08-10 20:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cf019a09ba2bd2fc9e2deef55171ccf SHA-1: 7eec55d0622c0bbd367c34dd1dc85b9ed9d269be SHA-256: 873f7f3632a8267d9b964b435ead0b56429499a49404b8e65c27ec829bb56a91
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to Shopify domains, suggesting an attempt to generate traffic through SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.cc', which is used to obscure the final destination. The document body, though heavily corrupted, contains the same URL as the malicious redirector, indicating it is the primary lure.

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.cc/pify?keyword=autocad+3d+bangla+tutorial+pdf
    • http://files.leontinevanvliet.com/uploads/1/3/1/4/131406592/dadimuf-mabipuwuwiw-lalutuvate-xepedajuwejiwul.pdf
    • http://lateb.kl-creation.fr/uploads/1/3/1/3/131380600/kefolupowovopilopizu.pdf
    • http://files.erikavanzin.com/uploads/1/3/1/3/131379590/4eb1265.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1945/3095/files/21807334732.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/jirewibupufetokugoragax.pdf
    • https://cdn.shopify.com/s/files/1/0428/2921/7958/files/18_chun_li_mugen.pdf
    • https://cdn.shopify.com/s/files/1/0441/2496/2968/files/enron_case_study.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/91435684623.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/timekelupo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8013/8398/files/40593350458.pdf
    • https://cdn.shopify.com/s/files/1/0434/5528/3366/files/64503132199.pdf
    • https://cdn.shopify.com/s/files/1/0433/8017/9107/files/biology_class_11_chapter_3_notes.pdf
    • https://cdn.shopify.com/s/files/1/0438/0635/9714/files/57621105704.pdf
    • https://cdn.shopify.com/s/files/1/0434/7330/5762/files/64748457436.pdf
    • https://cdn.shopify.com/s/files/1/0440/7335/3366/files/differences_between_american_and_british_english_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0428/7086/6076/files/50645163162.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_off000045ea.bin
d54531c5bcf296878596b06c1c0047a37e13ec19214e24f5c9d16867aa1afd22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45EA 5440 bytes
font_01_sfnt_off0000586f.bin
638c394924f0188bdff2bf1d2cd152784fe257584c5dab6378c37d696232dd43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x586F 8836 bytes

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