Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a39f0d3dc83b1d7…

MALICIOUS

PDF

55.1 KB Created: 2020-07-31 21:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0e15d34a65b6c0df4afb034e43041d2 SHA-1: 300757d79e7650da496bc9b0b10d9b8476b3a51c SHA-256: 7a39f0d3dc83b1d701305cff3c385845ac0b11004289156e6b5d3c4d725f3b36
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector (ttraff.cc). The ML classifier strongly flagged this PDF as malicious. The document body, though obfuscated, contains text related to combining PDFs and references the malicious URL, suggesting a lure to download malicious content or phish for information. The presence of many external links indicates a link farm, a common tactic for SEO poisoning or distributing malware.

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=combine+pdf+in+preview
    • http://files.greenhousethinktank.org/uploads/1/3/1/4/131407857/biwonarolok.pdf
    • http://files.ncam.ac.nz/uploads/1/3/0/7/130776788/a94fe6a1c2f25a.pdf
    • http://files.inspirelove.net/uploads/1/3/1/4/131453399/0b09b68ceea081d.pdf
    • http://files.mumbisdesigns.com/uploads/1/3/2/6/132695692/nejavareligaxolu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bokowolexom.pdf
    • https://cdn.shopify.com/s/files/1/0437/7824/4765/files/mekokep.pdf
    • https://cdn.shopify.com/s/files/1/0435/1092/3423/files/2776615647.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/18695412901.pdf
    • https://cdn.shopify.com/s/files/1/0435/3340/2266/files/pojujigopasozudamafusavu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4288/2215/files/buzonezamagitolisageris.pdf
    • https://cdn.shopify.com/s/files/1/0429/3532/0735/files/wuxilu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3549/2503/files/lubarosonoxanuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/jidezavotuzarevat.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006380.bin
63783481456585b3cf006dd71aeda1989b9e91fbaa0208fdc753617caad80acd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6380 7196 bytes
font_01_sfnt_off00007c10.bin
dc4a93287ba09b79ac0b1736447da38f3bea43d11124eb269d0be9b8b73eb6ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C10 4964 bytes
font_02_sfnt_off00008ced.bin
b2385a890b8570a12e69788d03925180d6ae77d4ec026fe63c4e05ebef3bd80b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CED 14620 bytes
font_03_sfnt_off0000ba83.bin
62586954845d9ad04bf5f6380249af1aca40386ab0983cb4f2a60b3b2fff5631		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA83 16080 bytes

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