Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2cf6afe6c2deff…

MALICIOUS

PDF

65.4 KB Created: 2020-11-24 05:39:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc50e5da2e5126c96686b7feb23d4662 SHA-1: 1eb521eecc5c8bcaefc2c6206928bc02af20f009 SHA-256: 6b2cf6afe6c2deff45eb05cbc781e6b980d4fa8f2d7855658ab7f23771d36219
214 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 hosted on link farms. One prominent link directs to 'gettraff.ru', a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/aws?utm_term=birthday+song+lyrics+free
    • https://ruparowix.weebly.com/uploads/1/3/4/3/134350000/b8635ba79084.pdf
    • https://beperiguvo.weebly.com/uploads/1/3/4/3/134320750/551704.pdf
    • https://cdn-cms.f-static.net/uploads/4379477/normal_5fa24e185ff69.pdf
    • https://musazowoxagaw.weebly.com/uploads/1/3/4/3/134323980/murigemitekiwewov.pdf
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/7702792.pdf
    • https://rulutateve.weebly.com/uploads/1/3/4/6/134653171/bojorow-kenesofasazi.pdf
    • https://cdn-cms.f-static.net/uploads/4382618/normal_5f9c9f295065a.pdf
    • https://ruwopevod.weebly.com/uploads/1/3/1/3/131397973/9112f73788.pdf
    • https://wawotixivawipi.weebly.com/uploads/1/3/4/4/134474061/movexumogekuvixe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sugaguxagu/xokam.pdf
    • https://s3.amazonaws.com/mulerux/super_shuttle_kansas_city_coupon_code.pdf
    • https://s3.amazonaws.com/wiwuxot/kuletewetokikajelizidim.pdf
    • https://s3.amazonaws.com/zukukelejurotef/dufekilatexewevikerixu.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_off0000c2f5.bin
8e49d31d6aaed18e3044250e2373ec724baa2d7bd5eabbd8130eacb6c012cb13
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F5 5436 bytes
font_01_sfnt_off0000d578.bin
92270ebcd24e9f09c07057676c58db1814b3f822bfa6c82983809f6b8d8dc325
pdf-font-stream PDF embedded font (sfnt) at offset 0xD578 10364 bytes