Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e8f7b1a0cb50c80…

MALICIOUS

PDF

46.4 KB Created: 2020-08-15 05:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61b769fa0feab0a6c7d841d4293d6ec6 SHA-1: 9b3610a2876783a331e1b5e12af2506c5c84026d SHA-256: 0e8f7b1a0cb50c80ee4873f7c765cc203b7e579104dedcd1b79ca8903135bb52
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.ru), indicating a phishing or malware distribution vector. 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=lonely+planet+cuba++pdf
    • http://files.dennismoconnor.com/uploads/1/3/0/7/130775373/wexavafivapat-bumuz-gepokavinaz.pdf
    • http://files.corehealthbemidji.com/uploads/1/3/1/4/131437765/a9723165e6992d.pdf
    • http://files.westkarateofweirton.com/uploads/1/3/0/7/130739169/d820f61.pdf
    • http://files.bloodsugarbikemagic.com/uploads/1/3/0/8/130813511/suvorevikawodi-sixagoremoz.pdf
    • http://tebeku.cworkssystems.com/uploads/1/3/0/8/130813821/2203074.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5736/2597/files/biochemistry_and_molecular_biology_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0450/7110/6211/files/beaux_arts_magazine.pdf
    • https://cdn.shopify.com/s/files/1/0427/9946/4611/files/guvubopufo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4619/9711/files/95408138775.pdf
    • https://cdn.shopify.com/s/files/1/0437/9593/9488/files/obs_discord_overlay.pdf
    • https://cdn.shopify.com/s/files/1/0435/4516/5975/files/27582409340.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6590/files/falufubalem.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/48258191510.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/how_to_get_andhra_bank_statement_in.pdf
    • https://cdn.shopify.com/s/files/1/0437/7015/1061/files/jafudisolub.pdf
    • https://cdn.shopify.com/s/files/1/0436/4750/0448/files/subolalafatavibiw.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_off0000783b.bin
31bcfae1ea2f2848089d21f238a183e812ca809069561e6540902630b8d73ace		 pdf-font-stream PDF embedded font (sfnt) at offset 0x783B 5060 bytes
font_01_sfnt_off0000898c.bin
f692b299628cf8bc8294e6ec42e8cfe6c6273f64d934810f20dd8ead1f1d484a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x898C 10356 bytes

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