Malicious PDF — malware analysis report

Static analysis result for SHA-256 87aa9521a3cd6585…

MALICIOUS

PDF

41.4 KB Created: 2020-08-02 06:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6cb19f32f87269adfd8174421fe00d92 SHA-1: 21f16c75089c6694b2ee0eecfbd5448f196dd641 SHA-256: 87aa9521a3cd6585c5af5180620e534c63e79bcf0aea8267eda5452c2c76c61f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=discord+code+tags', suggesting a lure to a malicious site. The presence of a large number of external PDF links further indicates a link farm or redirection scheme.

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=discord+code+tags
    • http://files.eatmooreproduce.com/uploads/1/3/1/8/131856160/da723b3.pdf
    • http://files.inthyme-dod.com/uploads/1/3/1/3/131397987/loludutosapufom.pdf
    • http://files.pathlightwisdom.com/uploads/1/3/1/3/131381612/bufodezexuf.pdf
    • http://files.importdollscarclub.com/uploads/1/3/0/8/130814601/6987727.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1133/2503/files/najetakarefu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3206/7748/files/13968231262.pdf
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/gelupokudekoxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1359/4526/files/lumona.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5476/files/31073163814.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/30148743080.pdf
    • https://cdn.shopify.com/s/files/1/0435/1646/1211/files/gujunisonoledufe.pdf
    • https://cdn.shopify.com/s/files/1/0428/5795/5487/files/96680489150.pdf
    • https://cdn.shopify.com/s/files/1/0429/5370/3590/files/mosaresuneziwotovov.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/sufegikar.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/duzowigagarejiroferegufi.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_off000063ee.bin
e1802383a486516d3b38f6f3b364282ad2b865b683c3d6cdf7c0c8d3b008d583
pdf-font-stream PDF embedded font (sfnt) at offset 0x63EE 5076 bytes
font_01_sfnt_off00007540.bin
624ed71e768b270e0a78addab2051c11bd0054317ebca27f28b8967f4ada7e16
pdf-font-stream PDF embedded font (sfnt) at offset 0x7540 10616 bytes