Malicious PDF — malware analysis report

Static analysis result for SHA-256 65861d1e587f31b7…

MALICIOUS

PDF

41.2 KB Created: 2020-08-10 03:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f8d7d3a8bc6806c8f34ac1a51fbc610 SHA-1: 5ceddcf10a60f3d57ad47b61700c6283f333491c SHA-256: 65861d1e587f31b767d55fa7399201d5f55f5c3d6228f8d1c2b9b2ac7405e986
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service designed to obscure the final destination. The primary malicious URL identified is `https://ttraff.ru/pify?keyword=ibm+maximo+asset+management+pdf`, which is flagged as malicious. The document body, though heavily obfuscated, also contains this URL and other benign-looking Shopify URLs, suggesting a link farm or SEO poisoning tactic to attract victims. 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=ibm+maximo+asset+management+pdf
    • http://files.businessmanagementorganizer.com/uploads/1/3/0/9/130969077/765f62582471.pdf
    • http://files.adamandevebendigo.com/uploads/1/3/1/4/131452733/97bf695b12a.pdf
    • http://xonab.city-beekeeper.com/uploads/1/3/1/3/131384635/dusexok.pdf
    • http://files.trinity-medford.org/uploads/1/3/0/8/130815014/xanujuterewena.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/lunugubuzudenilaret.pdf
    • https://cdn.shopify.com/s/files/1/0429/8312/9251/files/49018808270.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/32353158933.pdf
    • https://cdn.shopify.com/s/files/1/0433/6825/1543/files/31612527015.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6207/files/desipugesonipukaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8034/3967/files/adenite_mesenterica_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0434/9224/5666/files/performance_appraisal_interview.pdf
    • https://cdn.shopify.com/s/files/1/0431/1282/4993/files/41822957714.pdf
    • https://cdn.shopify.com/s/files/1/0435/8940/2783/files/wooden_toolbox_plans.pdf
    • https://cdn.shopify.com/s/files/1/0434/9159/0308/files/lamonezixefuzut.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/46060411184.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ferenap.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13503036424.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_off00006269.bin
6c1ccd061c56fab03b8b150200370f7c88f450ec5824c372020e98cf9659889c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6269 5376 bytes
font_01_sfnt_off000074a8.bin
fc1689c8b839e2567f63dd53d557749deea3c37a0d4b33778b7d542aa765fc72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74A8 10392 bytes

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