Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa8ba3cd77da959…

MALICIOUS

PDF

45.2 KB Created: 2020-07-08 12:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebb61bf696f40a0957c9fa64282e8743 SHA-1: 23aa1facb9af1a7bf4d0223c4b14c0c775c5dd72 SHA-256: 5aa8ba3cd77da959ceb4ddd2bf4a906520fcbebc80168ed8e77d0918b2a5e8bc
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent link, 'https://ttraff.cc/wb?keyword=free%20separation%20agreement%20template%20ontario%20pdf', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links and the redirector indicate an attempt to drive traffic to potentially harmful content.

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/wb?keyword=free%20separation%20agreement%20template%20ontario%20pdf
    • http://files.husbandandwifeworldtravels.com/uploads/1/3/1/3/131381612/2a43e92ee517a4.pdf
    • http://files.alaneisenstock.com/uploads/1/3/2/8/132814239/tiwopijomudi_wataxabe_benug_jomosoki.pdf
    • http://files.thelastvilla.com/uploads/1/3/0/8/130813668/xamevet.pdf
    • http://files.portageresourceguide.com/uploads/1/3/1/6/131606644/8719065.pdf
    • http://files.oliveadobe.net/uploads/1/3/1/1/131164007/kanaligilagu.pdf
    • http://files.kafyeblaan.com/uploads/1/3/1/8/131856381/becb5.pdf
    • http://files.mrbsfinest.com/uploads/1/3/2/3/132303080/wozesepivijiwox.pdf
    • http://files.barrvillemc.org/uploads/1/3/0/7/130776118/423244.pdf
    • http://files.one-voice-ethnic-missions.com/uploads/1/3/1/4/131407823/d9ab80aed869f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://metusazeb.files.wordpress.com/2020/06/9030078932.pdf
    • https://dakirujajuri.files.wordpress.com/2020/06/zugolasufuzolisiwizuvamek.pdf
    • https://nakaviditane.files.wordpress.com/2020/06/41723097705.pdf
    • https://fesegopized.files.wordpress.com/2020/06/tosowowuzobu.pdf
    • https://tuvivamitoti.files.wordpress.com/2020/06/jorulanokudaduburab.pdf
    • https://zamosoxodinu.files.wordpress.com/2020/06/61690873215.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074b6.bin
54b100de11e49342ea9b2fd627da6472b3b6212433602c1f1a7f482c7506d3be
pdf-font-stream PDF embedded font (sfnt) at offset 0x74B6 5104 bytes
font_01_sfnt_off000085f5.bin
1306af4bfcfaf34422926cedc0b4d88e5ef724c06e31a454d279386622e4b16b
pdf-font-stream PDF embedded font (sfnt) at offset 0x85F5 9928 bytes