Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff1b1dd614098d6…

MALICIOUS

PDF

58.4 KB Created: 2020-11-28 07:06:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfed9c7d41876229e5d7803b5d42fa11 SHA-1: 12f878fc0620ff9c39f56a254ce0d8ed3641ab7b SHA-256: aff1b1dd614098d610bf7f801ef4cb9e486a3fb9e4756f68586448fb0c1aa2ea
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm designed to generate traffic or distribute malicious content. One URL, 'https://traffmen.ru/123?utm_term=watch+tu+sooraj+main+saanjh+piyaji+online', is specifically flagged as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://traffmen.ru/123?utm_term=watch+tu+sooraj+main+saanjh+piyaji+online
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/xojotupexo_venoxixipup.pdf
    • https://bekijarodik.weebly.com/uploads/1/3/4/6/134617997/litamagul.pdf
    • https://mulelene.weebly.com/uploads/1/3/4/4/134440938/8535508.pdf
    • https://zovezeko.weebly.com/uploads/1/3/4/6/134697242/00b923e.pdf
    • https://zirodaxe.weebly.com/uploads/1/3/4/6/134611642/3280639.pdf
    • https://sonilotosoj.weebly.com/uploads/1/3/1/3/131379329/1bea7.pdf
    • https://gixawixo.weebly.com/uploads/1/3/4/3/134322292/rileketuvamusafateso.pdf
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/rozavulixifa_leziximin_lopavinodaxiwej_gexujoso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ff111f88-9a00-41fb-9d7b-2698c3d220f3/44002376465.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_off0000a74b.bin
cbc4a5255d425cbc6ceca426c1d3b48df3d587e5da8bcbe80a58962de0a15b19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA74B 5364 bytes
font_01_sfnt_off0000b972.bin
6ae34b8640cb33d12279c752bca9a5e274a5c123726b38f1097acdaf4bbb7df5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB972 10468 bytes

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