Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a8cd59e9e56690…

MALICIOUS

PDF

48.0 KB Created: 2020-07-30 08:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2843d15cd4de131bbb578488c77c1578 SHA-1: 58023897cbb82809d035c103586065818cae806e SHA-256: b0a8cd59e9e56690f93d2d312879c86eb847e3cae4d946afc37570a94cf0aa58
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links. One critical heuristic indicates these links point to a known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=adaptive+autosar+pdf'. Another heuristic identified a 'PDF link farm' with numerous external links, the first of which is 'https://cdn.shopify.com/s/files/1/0432/5238/3904/files/99976667443.pdf'. The document body is heavily obfuscated and does not provide clear textual intent.

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=adaptive+autosar+pdf
    • http://files.clingersnatural.com/uploads/1/3/2/3/132302764/jamenapira_farejanuj_tomanateber.pdf
    • http://files.luzafestival.com/uploads/1/3/1/4/131454151/3465562.pdf
    • http://files.midcoastconsult.com/uploads/1/3/1/3/131379718/mexujikulamo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5238/3904/files/99976667443.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/12381481209.pdf
    • https://cdn.shopify.com/s/files/1/0437/6153/3082/files/tiresiluzigora.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8807/files/nezawizegigopotivotanu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xugifewelogukepebokiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/1188/2653/files/sodesozur.pdf
    • https://cdn.shopify.com/s/files/1/0436/1561/7182/files/segaxevujano.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dedepisolutiri.pdf
    • https://cdn.shopify.com/s/files/1/0431/7190/5698/files/53507733794.pdf
    • https://cdn.shopify.com/s/files/1/0438/9008/1960/files/rulenuzunabiselosexefel.pdf
    • https://cdn.shopify.com/s/files/1/0438/8575/6568/files/sumupa.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/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xugifewelogukepebokiz

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008074.bin
529c2f4a82d847a7a2575ec62cd313fb9560d5a69e134cceb862220b8d1d5872
pdf-font-stream PDF embedded font (sfnt) at offset 0x8074 4828 bytes
font_01_sfnt_off000090fd.bin
0a2601c88b3f00f239a7c6386c85c87cd35c49a19d712da3e33108e5566e601a
pdf-font-stream PDF embedded font (sfnt) at offset 0x90FD 10124 bytes