Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2fbf848306635e9…

MALICIOUS

PDF

31.8 KB Created: 2020-08-25 16:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb84be9c7836c8096a1d17d73c009d75 SHA-1: 9d0a60c339c147ccbba49ec25d762f9c8b1fa81a SHA-256: d2fbf848306635e91c7a10e0ab9217790d9e4722fd7b428771f8e57c8fdf1aea
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious content. The document body also contains numerous links to external PDFs hosted on platforms like Shopify, suggesting a link farm or SEO poisoning tactic to attract victims. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful sites.

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.com/pify?keyword=macmillan+exam+skills+for+russia+answers
    • http://files.fnaq.org/uploads/1/3/0/9/130969944/nivubuluro.pdf
    • http://natijuve.allterrainridersatvclub.com/uploads/1/3/2/6/132681229/7500da67015.pdf
    • https://cdn.shopify.com/s/files/1/0430/9552/3485/files/50307407765.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0807/files/jexapegiduzowufapatilep.pdf
    • https://cdn.shopify.com/s/files/1/0435/1338/1028/files/69883907271.pdf
    • https://cdn.shopify.com/s/files/1/0438/2451/3181/files/nevewuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kulabegidubonigupux.pdf
    • https://cdn.shopify.com/s/files/1/0430/7389/6602/files/what_is_a_synonym_for_existential.pdf
    • https://cdn.shopify.com/s/files/1/0430/7045/5965/files/34439324886.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/93163062611.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_off00003fbf.bin
1d409764aa896bbed7931f45e2fff4ee98b8430b81800d496784387b7ec203b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3FBF 5256 bytes
font_01_sfnt_off000051a1.bin
21d39da569e737ebc683afd24cbe5fd3918fb965dfa6c5bc8dd1003b03d21572		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51A1 9692 bytes

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