Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ff34f6b05d6fc2…

MALICIOUS

PDF

43.9 KB Created: 2020-08-06 20:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcc3440d0698c58cb1b377b58c1d8a0f SHA-1: 5204a8da642c0f39689827b21a9ed9308a1720cb SHA-256: a4ff34f6b05d6fc255059d8a737aaab3d9871d95e04ed9d213975ef02a0b0dfa
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=entrepreneurship+development+pdf+calicut+university
    • http://files.fullmoonhealingarts.com/uploads/1/3/1/3/131383386/wojolugefip.pdf
    • http://files.ladyseacolts.com/uploads/1/3/0/7/130740561/nanusesujetufiromif.pdf
    • http://files.wallsofwondersaddlebrooke.com/uploads/1/3/1/3/131379719/kezedeboliv.pdf
    • http://files.cgc-detroit.org/uploads/1/3/0/9/130969061/puxixemokaba_pedagor_pibopoxa_nirus.pdf
    • https://cdn.shopify.com/s/files/1/0435/6158/2755/files/2535137541.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mozesuseb.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4615/files/61180567276.pdf
    • https://cdn.shopify.com/s/files/1/0429/4017/0406/files/bokikifamoditejiziloti.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/twitch_discord_webhook.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/fulokoza.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/28227027461.pdf
    • https://cdn.shopify.com/s/files/1/0434/0292/0086/files/classic_wow_bis_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2441/files/tuderurirudoboti.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006337.bin
dc8a1715a83376a9aae5db827550667f27bac645c1912154f880eabc3f07b0c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6337 5516 bytes
font_01_sfnt_off000075e2.bin
08dd5fd899a2c64fd4ca479d7155c7736dd649d3cb2d786c3732eb25d6184678		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75E2 14224 bytes

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