Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8af52df51213b9…

MALICIOUS

PDF

65.3 KB Created: 2020-11-13 08:39:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a076579ab354f3a2babd2ab0097ce29 SHA-1: e805854a92f42ee65f75c2647c09a6ba2fd50d8d SHA-256: aa8af52df51213b9d075d8396bfea61df68e096e3cb7abdf237de0f04c337af5
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://gettraff.ru/123?utm_term=german+definite+vs+indefinite+articles'. This URL is likely used to lure the user to a malicious site. The ML classifier also flagged this PDF with a high probability of being malicious. No scripts were extracted, but the presence of a malicious URL strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=german+definite+vs+indefinite+articles
    • https://cdn-cms.f-static.net/uploads/4392668/normal_5f8ff1f0bbe0d.pdf
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/mukobuf.pdf
    • https://bidovakufizal.weebly.com/uploads/1/3/4/5/134586087/2018308.pdf
    • https://cdn-cms.f-static.net/uploads/4446759/normal_5fae0386a5859.pdf
    • https://ralevenewuw.weebly.com/uploads/1/3/4/4/134464099/6672972.pdf
    • https://cdn-cms.f-static.net/uploads/4368746/normal_5f9002a0000de.pdf
    • https://cdn-cms.f-static.net/uploads/4499633/normal_5fab5f9766f25.pdf
    • https://cdn-cms.f-static.net/uploads/4421959/normal_5faac7eb39683.pdf
    • https://cdn-cms.f-static.net/uploads/4403259/normal_5fa1cecb8c89a.pdf
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f87a4c6555ac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muvunekagok/kejiwiruwikerivalulajudo.pdf
    • https://uploads.strikinglycdn.com/files/bf2ceace-96cd-41e8-9814-e60ea49d2c65/15006196159.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_off0000c385.bin
f1deb112dc324ed12eb89c0ac8e6ac18d591ca98710c468f0d43ba4065611ec8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC385 5256 bytes
font_01_sfnt_off0000d55a.bin
f72e1af29905db890c1a084fcd334cf3f1a0b28eccd4e3c0a339a1d980644f92
pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 10272 bytes