Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4aa62399032bd1…

MALICIOUS

PDF

69.0 KB Created: 2020-11-28 05:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: cac4cbd254f6f17d5395e198c70922b5 SHA-1: 54de4499ce81a8d498ccc2272494e53540eeb8a9 SHA-256: 8e4aa62399032bd12df3f6d0815d832b10ab6ee0f75e7c9ad341c4544979a648
214 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, traffmen.ru, which is likely used to distribute further malware or phishing content. The document also hosts a large number of external PDF links, suggesting a link farm designed for SEO manipulation or to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=animal+jam+codes+for+membership+2016 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377391/normal_5f96803476427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_5f8d128b54693.pdfIn PDF document text
    • https://ramitafot.weebly.com/uploads/1/3/4/3/134340854/vudefuri-nuvof-selanedawagotir-bejelesidugokud.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/3717000.pdfIn PDF document text
    • https://suleduzon.weebly.com/uploads/1/3/4/4/134403341/mulafoduzad.pdfIn PDF document text
    • https://xurolimusogisuw.weebly.com/uploads/1/3/4/3/134395808/pesin.pdfIn PDF document text
    • https://lifigosup.weebly.com/uploads/1/3/4/8/134884960/jajirufamovuji-lubisureb-jagoxujaju-lativijosomijas.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/7057c1aa9d986.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/6168241.pdfIn PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/zameva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/civil_war_leaders_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/g_four_letter_words.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/24674009747.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/wutekofimusozalinopifewi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFF 6080 bytes
SHA-256: 0a827c0222797bee58288a13f5fec4d87fe5da5a2de619e6e47d23697b6e9eb1
font_01_sfnt_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 11264 bytes
SHA-256: 2cdc236334b29cdea1e5a922196c5cf9a20934f02aca383e4d0c8e3100bbeb5b

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