Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b88aabe67ee9ab0…

MALICIOUS

PDF

43.5 KB Created: 2020-08-19 01:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcc457c77020bb75d5a97c192329c479 SHA-1: 8af8a83daea403f577ef123b95c94ed66b4cfeb5 SHA-256: 8b88aabe67ee9ab01ecdcfc480cfc17d82ea8caeaefbb0bf97d9a83a82b47822
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=david+goggins+can%2527+t+hurt+me', indicating a malicious intent to redirect users to harmful content. The document body, though partially corrupted, contains references to the book 'David goggins can't hurt me' and the wkhtmltopdf tool, likely used to generate the PDF, further supporting the lure. The ML classifier also strongly flagged this PDF as malicious.

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=david+goggins+can%2527+t+hurt+me
    • http://files.elegantcooking.com/uploads/1/3/2/7/132710638/2920870.pdf
    • http://files.kindredthreadstx.com/uploads/1/3/1/4/131453251/mukoziju_nofemudop_renawok_taposudixe.pdf
    • http://files.annranderaadpottery.com/uploads/1/3/1/4/131453897/5351809.pdf
    • http://files.ridgewaywilts.com/uploads/1/3/1/3/131379054/numutexukisosin_kelubifexeg_zomofeja_bamitarenigeni.pdf
    • http://files.fountainheadmuseum.com/uploads/1/3/1/6/131606360/pulusedejiku_zitupakekarani_wixanixosep.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3630/files/poliwo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5941/files/59647591576.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5195/files/relekapodoxafisarubepug.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7110/files/62994719340.pdf
    • https://cdn.shopify.com/s/files/1/0435/9369/5391/files/14051823636.pdf
    • https://cdn.shopify.com/s/files/1/0434/8179/2664/files/35297562972.pdf
    • https://cdn.shopify.com/s/files/1/0431/7334/7488/files/71895976540.pdf
    • https://cdn.shopify.com/s/files/1/0435/0191/2224/files/11384802923.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/essential_and_nonessential_fatty_acids.pdf
    • https://cdn.shopify.com/s/files/1/0430/6075/6641/files/47806204357.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/dabemukokufumidep.pdf
    • https://cdn.shopify.com/s/files/1/0435/7731/1391/files/general_zoology_laboratory_manual.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_off00006a4b.bin
8dafa7554b82cdc9e10662178507a1aece2b31b1179bae95ab677aa96857c308		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4B 5416 bytes
font_01_sfnt_off00007c9a.bin
971c1d902f78ef3bbd5f57f1d1df8490a842b57c253dc2896b2c86197afd335d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9A 10704 bytes

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