Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d8c5aedeb5d29a…

MALICIOUS

PDF

41.5 KB Created: 2020-08-01 21:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25a2086f4fa162f88e2ea27752cd7080 SHA-1: ced71bcc84f92e7dd0f80757d3ddf496c6d3a40c SHA-256: c5d8c5aedeb5d29ab380fbe7bf093a07e7cdd098ff6d785d32e948d454404d97
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one critical heuristic identifying a link to a known malicious redirector at 'ttraff.ru'. This redirector is disguised with a keyword related to 'Iowa courts online efile', suggesting a phishing lure. The document body, though heavily obfuscated, also contains this URL and numerous other links, many hosted on Shopify, likely part of a link farm to improve SEO for the malicious redirector. The ML classifier strongly indicates 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=iowa+courts+online+efile
    • http://files.napasugar.com/uploads/1/3/1/4/131406108/dogekarezapise.pdf
    • http://files.lydiayapp.com/uploads/1/3/2/7/132710753/pinaserik.pdf
    • http://files.leonardopallenberg.net/uploads/1/3/1/4/131437689/6731352.pdf
    • http://files.therealdealwyatt.com/uploads/1/3/1/8/131856285/9246a3.pdf
    • https://cdn.shopify.com/s/files/1/0440/8619/8424/files/96565111142.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7870/files/sidamig.pdf
    • https://cdn.shopify.com/s/files/1/0434/9201/6280/files/80331736785.pdf
    • https://cdn.shopify.com/s/files/1/0434/2644/7525/files/54360854108.pdf
    • https://cdn.shopify.com/s/files/1/0428/9721/1551/files/lalajufazanefi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5278/6074/files/zetikodisavi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6435/1130/files/70694832310.pdf
    • https://cdn.shopify.com/s/files/1/0435/9307/2808/files/4930413820.pdf
    • https://cdn.shopify.com/s/files/1/0437/7188/7767/files/36952507122.pdf
    • https://cdn.shopify.com/s/files/1/0431/5168/7848/files/zatigiwanesaxamo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6285/3794/files/foxekojolowilidozo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8036/files/jujinirifemanogi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1384/0793/files/63123497297.pdf
    • https://cdn.shopify.com/s/files/1/0435/1806/6842/files/81486559328.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_off000063bb.bin
4dc7ab9d555ecc0870695224870bbcff4770163f228aade695107f2bd901881a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63BB 4904 bytes
font_01_sfnt_off0000748a.bin
32078553e456b3c1304d0d27c0efb95bdddb52dfdeed40071bbe1bc971cc3733		 pdf-font-stream PDF embedded font (sfnt) at offset 0x748A 10992 bytes

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