Malicious PDF — malware analysis report

Static analysis result for SHA-256 5141f95746982d52…

MALICIOUS

PDF

46.2 KB Created: 2020-09-16 16:38:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 181d346e07efe1167aa4fd9e5ab108dd SHA-1: 5c01f19227196cb1b6b27c9bae665ba3f1490cd4 SHA-256: 5141f95746982d523b36832db79097d6e369ef5a55839e46017b69985021c3cf
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded URL is part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content broadly. The document body, though heavily obfuscated, contains the target URL.

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.link/wix?keyword=manual+for+simpson+pressure+washer
    • http://fabag.bscyouth.com/uploads/1/3/1/8/131858685/4648765.pdf
    • http://files.banditaerialproductions.net/uploads/1/3/2/7/132740291/4ebbac.pdf
    • http://tezofazag.opalfund.org/uploads/1/3/1/3/131379833/kuzobife_rojoganuto.pdf
    • http://zasimose.lts3d.com/uploads/1/3/1/3/131380126/35687.pdf
    • http://sobenomu.mnleu.org/uploads/1/3/0/7/130739956/nutovoxanamuwer.pdf
    • http://vufanaj.megaworldglobal.com/uploads/1/3/0/7/130775840/tilerin.pdf
    • http://files.balancedpets.ca/uploads/1/3/1/0/131071166/zowilazefibalafa.pdf
    • http://surisat.michellelewisphotography.com/uploads/1/3/1/4/131438110/revivudidenoz_kuzuzefejaluso.pdf
    • http://files.lashesbymatick.com/uploads/1/3/1/8/131856703/todovutuzine.pdf
    • http://files.poesyfloralstudio.com/uploads/1/3/1/4/131407315/gomagof.pdf
    • http://supiwon.the-nature-atelier.com/uploads/1/3/2/6/132682974/takotobabi.pdf
    • http://files.theplayfactoryplaygroup.com/uploads/1/3/2/7/132740541/fd4f13d.pdf
    • https://f8b3e3f6-ee49-4644-b456-28f20539578b.filesusr.com/ugd/33ab24_6231f8dbe19a403d8c53e27f53444076.pdf?index=true
    • https://b2075dfc-ba55-426f-8afc-17278c198443.filesusr.com/ugd/29c71c_57f396c443b0400282f328bd520328ea.pdf?index=true
    • https://922f97ee-02f7-42a9-afb1-103697487136.filesusr.com/ugd/c5d40f_9b76a8a6fbcb4afc888923dea9d8e51f.pdf?index=true
    • 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_off00007621.bin
38fa3cbc259331cce1b242be43f6a9af9122a005020d64df76d2f1715912d1a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7621 5236 bytes
font_01_sfnt_off000087e5.bin
edaa6e2b325c915d2dd9088985bfbbc6d61320cc1c2f947f8d326308ee5606eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x87E5 10480 bytes