Malicious PDF — malware analysis report

Static analysis result for SHA-256 1877a93f09ecdcab…

MALICIOUS

PDF

91.3 KB Created: 2020-11-04 23:22:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec18054b24a3c17d09b970ed707b152c SHA-1: 541115f3d7beb23f11a7d3c8ff4d1c51fc4e4ca5 SHA-256: 1877a93f09ecdcab76ab4568379a0dae23d49262c416fb1a071f513d4fefca35
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or spamming operation. The ML classifier also strongly flagged this PDF as malicious. The embedded URL 'https://ttraff.ru/123?keyword=thx+deep+note+clg+wiki' is a primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?keyword=thx+deep+note+clg+wiki
    • https://zepaxanodufinek.weebly.com/uploads/1/3/4/4/134455649/zorefugim_ketomuvuxi_wuxujana_jovibewitug.pdf
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/bufirit_nukefowake_gugoba.pdf
    • https://donodofi.weebly.com/uploads/1/3/1/8/131856097/7195609.pdf
    • https://tisatazufewuvo.weebly.com/uploads/1/3/1/1/131163687/vivis_mozirisamewo_xolijex_panulurebu.pdf
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/balatipolimol.pdf
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/rifanowoxegag_xumipefav_xowotesudomeba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/f8f37fec-23d9-4f4c-bfdb-755739bcdde8/52455448766.pdf
    • https://uploads.strikinglycdn.com/files/20a99044-bdaa-4eeb-9919-c4384083e2ea/10889067782.pdf
    • https://uploads.strikinglycdn.com/files/5ef93703-2bc4-49c7-9ba0-58d1e5efe17b/nexuro.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b1b.bin
fc9045065f2c2395cfc0344682d3032cd0778cdb36eb75a5d725289c1e9ca445
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 4812 bytes
font_01_sfnt_off00012b88.bin
7691054b0066fd325ebd321670e5cf00aa681a7bb5c34ef5024830ba3263f130
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B88 11596 bytes
font_02_sfnt_off000152c2.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x152C2 4324 bytes