Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f54b8e310876bc…

MALICIOUS

PDF

72.7 KB Created: 2020-12-25 12:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 903ac42969c6d1383ffb809412e38b2f SHA-1: 75d0df0f6aa6f4318126e168d850ea08fd2ee15b SHA-256: 59f54b8e310876bc33357f9f185ced07d182c27e4c4cb3c4009e4923fad096b5
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to malicious content. The primary redirector URL, https://gettraff.ru/strik?utm_term=rush+rally+3+download+uptodown, suggests a lure related to software downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=rush+rally+3+download+uptodown
    • https://zokukomusisitu.weebly.com/uploads/1/3/5/3/135323242/9840b0b45870.pdf
    • https://tamilavijunaw.weebly.com/uploads/1/3/4/5/134506647/709490.pdf
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/333677.pdf
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/6591310.pdf
    • https://lamekibig.weebly.com/uploads/1/3/4/6/134652122/7997241.pdf
    • https://junalupi.weebly.com/uploads/1/3/4/4/134460459/00428daec.pdf
    • https://fetepidema.weebly.com/uploads/1/3/4/6/134684810/gujopolesiraguz.pdf
    • https://losepubi.weebly.com/uploads/1/3/4/5/134502138/migawuzib.pdf
    • https://wunawewob.weebly.com/uploads/1/3/0/7/130775592/1366259.pdf
    • https://cdn-cms.f-static.net/uploads/4385009/normal_5fad607e1bacf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/3ccd4619-74e3-4fc6-abc2-023f13ac2df7/gumegajutumovo.pdf
    • https://uploads.strikinglycdn.com/files/50fd21be-f12e-4206-9b03-be4c6ca6cee6/7-3_cell_boundaries_worksheet_answers.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_off0000d126.bin
d5b5d62c6d200cc37c71aef1ccb0a09ec300a098a6e9f468ad5c6bbf2dc34cdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD126 5128 bytes
font_01_sfnt_off0000e29b.bin
df8b8c25295d2556e7e77365287dd094bf0bff23166ec719bd04c48680e3c49c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 11404 bytes
font_02_sfnt_off000107ff.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 4324 bytes

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