Malicious PDF — malware analysis report

Static analysis result for SHA-256 708250986bef4fe4…

MALICIOUS

PDF

39.0 KB Created: 2020-08-20 10:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b7c760982a383b82e6777a02f101fd6 SHA-1: fcb18bc25c71f101f94ac1400fe273e7484685dd SHA-256: 708250986bef4fe4f297b470187701c224c01ecdc130bb13e61cd23f73fdd0cf
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as medical information, which redirects to a known malicious infrastructure. The document also hosts a large number of external PDF links, many of which are hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the embedded link is a critical finding.

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=vascular+malformations+treatment+in+philadelphia
    • http://files.bgshuntmechanical.ca/uploads/1/3/0/7/130739678/21a61a0e.pdf
    • http://files.vonderhauswulfgermanshepherd.com/uploads/1/3/1/3/131378943/figoxomabojara_bexukolo.pdf
    • http://jevukox.stjoachimparish.net/uploads/1/3/0/8/130813372/retiwodelovu_nederumubipakix_govewofo_vizudeguxixon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4327/3369/files/64193546858.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4829/files/insanity_workout_program.pdf
    • https://cdn.shopify.com/s/files/1/0430/2484/2906/files/35668140254.pdf
    • https://cdn.shopify.com/s/files/1/0428/5690/6911/files/51309894856.pdf
    • https://cdn.shopify.com/s/files/1/0429/2263/9527/files/zajusigere.pdf
    • https://cdn.shopify.com/s/files/1/0435/2930/6263/files/41927195188.pdf
    • https://cdn.shopify.com/s/files/1/0445/9190/6980/files/battle_dogs_apk_revdl.pdf
    • https://cdn.shopify.com/s/files/1/0439/2094/9416/files/oxford_collocation_dictionary_apk_unlocked.pdf
    • https://cdn.shopify.com/s/files/1/0432/9648/9632/files/nisafubumefixajexo.pdf
    • https://cdn.shopify.com/s/files/1/0438/5302/1344/files/36202867587.pdf
    • https://medlineplus.gov/brainmalformations.html
    • 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_off00005c40.bin
5dde91485e4296336c85626a820616d5725d155ded9b5dc4d782fc14b3c75972
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C40 5360 bytes
font_01_sfnt_off00006e4b.bin
72527e8654eab123ad27d7c26b7c2403d82069fc156b3cab936865cd3eb173c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E4B 9676 bytes