Malicious PDF — malware analysis report

Static analysis result for SHA-256 817137b8c6b449b2…

MALICIOUS

PDF

45.9 KB Created: 2020-08-16 22:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a874aadd6e48946242b9251dcd96ab2b SHA-1: 01755c9aa4b7fcd8a0c9a5692ce180a2467b62d3 SHA-256: 817137b8c6b449b233311387b0e4961409a62d899fda265c6d1a8cb3f006b602
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to a redirector service known to host malicious content. The document body, though partially corrupted, includes the URL https://ttraff.cc/pify?keyword=sheet+silicate+structure+definition, which is flagged as a malicious redirector. This suggests the document's primary purpose is to redirect users to malicious sites, likely as part of a phishing or scam 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.cc/pify?keyword=sheet+silicate+structure+definition
    • http://files.denmarkffa.com/uploads/1/3/2/8/132814900/7893790.pdf
    • http://files.thestudiosav.net/uploads/1/3/0/8/130814534/bufuse.pdf
    • http://files.adamhitchcockdesign.com/uploads/1/3/1/3/131382032/vodeku-vegurivovoxe-tubisojuboweko.pdf
    • http://geguwa.littlesilverems.com/uploads/1/3/0/7/130775455/fogipobo.pdf
    • http://files.actionlearning.nl/uploads/1/3/2/8/132814073/6d35c049b8cb37.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6728/5410/files/42641334969.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/zadiradikudeliwafa.pdf
    • https://cdn.shopify.com/s/files/1/0438/3621/1357/files/23703590620.pdf
    • https://cdn.shopify.com/s/files/1/0437/2565/2117/files/rifobijaxun.pdf
    • https://cdn.shopify.com/s/files/1/0433/3853/0965/files/pradeep_biology_class_9.pdf
    • https://cdn.shopify.com/s/files/1/0434/0364/0993/files/kinede.pdf
    • https://cdn.shopify.com/s/files/1/0434/0819/5751/files/advanced_language_practice_michael_vince_macmillan.pdf
    • https://cdn.shopify.com/s/files/1/0428/8613/5961/files/90509043041.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7224/files/bunulerasabup.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/naxepigetulorew.pdf
    • https://cdn.shopify.com/s/files/1/0433/3725/3023/files/canon_mp160_ink.pdf
    • https://cdn.shopify.com/s/files/1/0430/6780/1749/files/xowimojasusoleferop.pdf
    • https://cdn.shopify.com/s/files/1/0434/7458/3702/files/21683765303.pdf
    • https://cdn.shopify.com/s/files/1/0433/2797/9678/files/4956354320.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_off00007495.bin
af65f5c0ffe350aa5f5b797230b4e1996f7155e0bddb1cc2f04f3449760177b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7495 5212 bytes
font_01_sfnt_off00008643.bin
61af1a0bfd4c06ad25063ce26bbd4608f889a2273bf73eeff6642e7d22487a2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8643 11148 bytes

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