Malicious PDF — malware analysis report

Static analysis result for SHA-256 33faf434d91e5bde…

MALICIOUS

PDF

46.6 KB Created: 2020-08-11 17:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 141b0531287bf6b37082259c2f3d0699 SHA-1: 44c40a8b54387b7d55fe44ebebd3f3ff75113434 SHA-256: 33faf434d91e5bde23dc511a15c4da55d01b777aa8a39ef9d9540610a76576ca
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 redirector services or link farms designed to obscure the final destination. The primary malicious link identified is 'https://ttraff.ru/pify?keyword=interview+form+format+pdf', which is flagged as a known malicious redirector. The document's structure and content suggest a phishing or scam attempt, likely using the 'interview form' lure to entice clicks.

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=interview+form+format+pdf
    • http://files.paigeelizabethblog.com/uploads/1/3/1/3/131398322/povur_likebebidefuse_xumajapofukozo_topozabegir.pdf
    • http://files.prairieolive.ca/uploads/1/3/1/6/131606984/zomijinovajuxeji.pdf
    • http://files.chezhospice.org/uploads/1/3/0/7/130776826/8e89d251ed880.pdf
    • http://files.thecouragetogrieve.com/uploads/1/3/1/4/131482941/beburazatuzo-lurus-dijojuromim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/2085/2122/files/xegosiwatepenuvofilu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/lojap.pdf
    • https://cdn.shopify.com/s/files/1/0434/0157/6602/files/carry_on_mr_bowditch_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/7418/2563/files/lilabonimezomosawu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7863/1072/files/18039754409.pdf
    • https://cdn.shopify.com/s/files/1/0437/4344/5141/files/39328498252.pdf
    • https://cdn.shopify.com/s/files/1/0430/7314/2933/files/nilivur.pdf
    • https://cdn.shopify.com/s/files/1/0438/4410/8453/files/physiology_a_k_jain.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8120/files/27750371373.pdf
    • https://cdn.shopify.com/s/files/1/0430/0180/6997/files/95267114858.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1632/files/70748652533.pdf
    • https://cdn.shopify.com/s/files/1/0430/8120/3861/files/36284220453.pdf
    • https://cdn.shopify.com/s/files/1/0435/9897/1038/files/gajuladoxaf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ca4.bin
289f6d448f2021d2f95764cfc8b4431171ab97b7f97db03194a8c169c7d03a74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA4 4856 bytes
font_01_sfnt_off00007d15.bin
57df0358cb0feca4da03b8f0452a12b1a06d8929378265e64429116086be4517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D15 10176 bytes
font_02_sfnt_off00009fa8.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FA8 4324 bytes

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