Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e9593d6b73bf45…

MALICIOUS

PDF

41.3 KB Created: 2020-08-16 21:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b2d972042b52dd26874f3b7b0bf021a SHA-1: 6d6b7fd96cb0a00fed2caf0ed9304df58ff01276 SHA-256: 27e9593d6b73bf4532c1f259ec24635cfb2c7a192affd4b0097fd9e032ec729f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=natural+rubber+sheet+uk'. Additionally, it exhibits a PDF link farm with numerous external links, many hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the redirector and link farm indicates a likely phishing or SEO abuse attack pattern.

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=natural+rubber+sheet+uk
    • http://files.keepeducationpublic.org/uploads/1/3/1/4/131483955/93ef8.pdf
    • http://files.kylerwilcock.com/uploads/1/3/1/6/131606331/806807.pdf
    • http://files.daniellechopin.com/uploads/1/3/0/7/130776336/920200.pdf
    • http://files.barcelonaappartement.com/uploads/1/3/1/0/131069886/wemamapukulo.pdf
    • http://files.daniellechopin.com/uploads/1/3/0
    • https://cdn.shopify.com/s/files/1/0431/0709/0581/files/nutebikikagiwatekusevosok.pdf
    • https://cdn.shopify.com/s/files/1/0437/6068/1109/files/1970c10_for_sale.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jokesinoximirupabujikupoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/6403/2422/files/liruxuviwanepoxiliz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3077/files/zexabubud.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8401/files/13275906990.pdf
    • https://cdn.shopify.com/s/files/1/0432/3354/2303/files/95626554148.pdf
    • https://cdn.shopify.com/s/files/1/0437/8702/6581/files/15065379332.pdf
    • https://cdn.shopify.com/s/files/1/0437/4288/8097/files/encontro_uma_abordagem_humanista.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4434/files/77516316912.pdf
    • https://cdn.shopify.com/s/files/1/0434/4610/8312/files/kudatiworizigijabanib.pdf
    • https://cdn.shopify.com/s/files/1/0429/2041/1303/files/rowegixafejupuzuril.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/59212752389.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064fb.bin
d8159d9f012c7c74dc661d25f5fe6b28b2e8a011f2154040f5a18b0a931522b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FB 4944 bytes
font_01_sfnt_off000075bf.bin
7309eb60cc6ac407c18c6624e7cf080bb5f876d99a01863373228a574f29dcf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75BF 10152 bytes

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