Malicious PDF — malware analysis report

Static analysis result for SHA-256 0176d374ab0d4b60…

MALICIOUS

PDF

37.7 KB Created: 2020-08-25 14:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ecffabb8627523e214f7fe2912da550 SHA-1: acd871692050316255329c1ad2a41c880a5a3005 SHA-256: 0176d374ab0d4b60deb93f7d07855ca9a6f36ffabbd8349c57d9d0f5b0459fe8
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, appears to contain references to the same malicious URL and other Shopify-hosted PDF links, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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=super+smash+ultimate+donkey+kong+guide
    • http://podijub.littlegreenjeep.com/uploads/1/3/1/1/131163864/fe78c113.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0951/5413/files/vocabulaire_juridique_anglais_franais.pdf
    • https://cdn.shopify.com/s/files/1/0434/3490/1660/files/secreto_biblia_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0450/5419/7910/files/masame.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/mikobiperubigopejez.pdf
    • https://cdn.shopify.com/s/files/1/0438/9853/6091/files/engineering_applied_physics_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/5345/7320/files/49687168096.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/68398143248.pdf
    • https://cdn.shopify.com/s/files/1/0434/4548/5725/files/zifolorewekurop.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6437/files/35123690917.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_off000056db.bin
d9eb229be618568e14574d80ef09e1a988b9b8608db490b237b9876faebba17f
pdf-font-stream PDF embedded font (sfnt) at offset 0x56DB 5640 bytes
font_01_sfnt_off000069eb.bin
9c36ac80a2b40bbeba16d60192d86b88ef634b2185e536bfe836ea4c7aab5dc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x69EB 9568 bytes