Malicious PDF — malware analysis report

Static analysis result for SHA-256 76313f269a0f2289…

MALICIOUS

PDF

43.7 KB Created: 2020-07-08 20:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f20c3c8a851623271925486ace66817a SHA-1: b4a8ad79c03bc63766ca96de955054a44e228424 SHA-256: 76313f269a0f22895e4d61fcc85539a6e79de64feb429228dc930916da3611f2
184 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files hosted on disposable domains, indicative of a link farm or SEO manipulation scheme. One of the embedded URLs, https://ttraff.ru/wb?keyword=graco%20roadmaster%20jogger%20stroller%20manual, is flagged as a malicious redirector. The ML classifier strongly indicates maliciousness, and the overall structure suggests an attempt to drive traffic to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=graco%20roadmaster%20jogger%20stroller%20manual
    • http://files.rioxpvista.com/uploads/1/3/1/6/131637034/36c763c9765.pdf
    • http://files.waiheelimu.org/uploads/1/3/1/6/131607174/nomuvawezilamaranu.pdf
    • http://files.sopoochtraining.com/uploads/1/3/2/8/132815961/kawivibugakovuj.pdf
    • http://files.jeffcofiretraining.org/uploads/1/3/2/6/132681409/4110604.pdf
    • http://files.remembermequiltguildbr.com/uploads/1/3/0/7/130775752/9570114.pdf
    • http://files.graffitiwgratitude.com/uploads/1/3/0/7/130738814/808e7b1556b9ad.pdf
    • http://files.4-ucorp.com/uploads/1/3/0/7/130739567/7385382.pdf
    • http://files.ec7mmea.org/uploads/1/3/1/6/131606550/6468148.pdf
    • http://files.bluenosewoodworks.com/uploads/1/3/2/8/132815961/somokirolurujewikusi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fojesezowivi.files.wordpress.com/2020/07/5974968273.pdf
    • https://jonaluzoj.files.wordpress.com/2020/07/86059365698.pdf
    • https://zonutebeva.files.wordpress.com/2020/07/56039349309.pdf
    • https://wajojewo.files.wordpress.com/2020/07/kolozotajofoga.pdf
    • https://tajejow.files.wordpress.com/2020/07/vedovoborogexomoza.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wojilezufaguxulidumusad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86662201832.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93861148098.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_off00005cb0.bin
b3bbf62d6b17b07f8eca4a1b9f2582a77d72cc21d5a7064480f042222740dc06
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB0 5200 bytes
font_01_sfnt_off00006e53.bin
03854456d00342a71f199e4c6b3f215b4f9d751be5c475be21a6719b129ee349
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E53 15856 bytes