Malicious PDF — malware analysis report

Static analysis result for SHA-256 41dfc103fb56665a…

MALICIOUS

PDF

76.0 KB Created: 2021-01-01 17:01:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 041a58fc8513efa0befe13795906ce9b SHA-1: d23ae310b5c1a257c88546b3adf22090878767da SHA-256: 41dfc103fb56665a930a3012ff5b95ee77df3357ff0b7e9c4b4e4f48d52f2b66
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector link farm. One of the primary links directs to 'traffmen.ru', a known malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

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-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://traffmen.ru/123?utm_term=apk+geometry+dash
    • https://siwizapetodid.weebly.com/uploads/1/3/4/0/134041585/xidefazofe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xaliwalufoguni/adobe_animation_software_free.pdf
    • https://s3.amazonaws.com/vovabagubajegeb/jinakositogikowugiw.pdf
    • https://s3.amazonaws.com/leteraxewe/fepisawarulasimem.pdf
    • https://s3.amazonaws.com/turip/nejizisif.pdf
    • https://uploads.strikinglycdn.com/files/104f429b-1c07-4235-8aaf-ed74a99765f7/80100866964.pdf
    • https://s3.amazonaws.com/godoremitiwuja/unblocked_games_agario_io.pdf
    • https://s3.amazonaws.com/tesodagiwor/anxious_for_nothing_lucado.pdf
    • https://uploads.strikinglycdn.com/files/018d9c45-8c42-4d57-8eba-6593bf7e305a/integration_of_ln_x3.pdf
    • https://uploads.strikinglycdn.com/files/35e2176f-7a2a-43cf-a466-cf49f0507399/gajasevawasawirufobi.pdf
    • https://s3.amazonaws.com/mexesazaxasa/35786394869.pdf
    • https://s3.amazonaws.com/navoburarovada/paxexojusilazigeditevogod.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_off0000ea96.bin
ff36eb9c2e9ce029cd0ee53a8d665ec4b246ecf5c88f9f1e5f514f5d85af34b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 5496 bytes
font_01_sfnt_off0000fd28.bin
11fe4e8af936f4972c6085280ee60a0888ee6943f6a7bba732bc0562d810de99
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD28 11592 bytes