Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc63ba6b1d7f20e…

MALICIOUS

PDF

67.8 KB Created: 2020-11-09 21:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 245882b3fedab57d5ce4146ea68f4592 SHA-1: 1e66b9228994b1887f5c3abe065432ba1b5876fd SHA-256: bfc63ba6b1d7f20ee54bcb53b12bc7b8dfe69a8b0c4f18277c42a71a454a3900
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many of which are SEO-optimized, suggesting a link farm designed to direct users to potentially malicious content. The primary IOC is the external URI pointing to 'trafffi.ru', which is likely the intended destination for the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/123?keyword=20+20+by+linda+brewer+analysis
    • https://duxixujojive.weebly.com/uploads/1/3/0/7/130739103/balalavixiwukazizupu.pdf
    • https://valekide.weebly.com/uploads/1/3/4/5/134584612/retotiku_denuta_paweti.pdf
    • https://weduxuvup.weebly.com/uploads/1/3/4/3/134308116/vejuzo.pdf
    • https://cdn-cms.f-static.net/uploads/4454290/normal_5fa1260770631.pdf
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/c9067531.pdf
    • https://cdn-cms.f-static.net/uploads/4377379/normal_5f9a638f784f4.pdf
    • https://mutimerujufidi.weebly.com/uploads/1/3/4/5/134526942/pojotarufor_jagulumegiva_wiroziresiza_tuwazatoli.pdf
    • https://taxajadotediru.weebly.com/uploads/1/3/0/8/130873824/0832d4755acb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fadedosi/who_were_the_forgotten_men_apush.pdf
    • https://s3.amazonaws.com/jakujakula/pre_trip_inspection_videos_with_dump_truck.pdf
    • https://s3.amazonaws.com/jeduzizonox/speed_hack_game_apk_no_root.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_off0000cbf8.bin
c5a0a5088b278318da06e9df9c66a45e035994490351caf45aeacae7fe6db437
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF8 5332 bytes
font_01_sfnt_off0000de31.bin
c6b4b43937842d43bb80acab02e8e940fbe66df26e3b5fcaeb5e18a1d84bd1ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE31 10572 bytes