Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3f6fe4a9a49a82…

MALICIOUS

PDF

66.0 KB Created: 2020-12-20 02:17:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 014c3fed22387e4ee75ecd6cbeb719ae SHA-1: 4c5aab1a70af5d8c993e61f1c9c124a103dcc464 SHA-256: cb3f6fe4a9a49a82ca66cccd901de02c17dd4e52d8ce10534e04f84625edd012
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to gettraff.ru. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many of which are numeric slugs. The ML classifier and ClamAV also strongly indicate maliciousness, specifically phishing. No scripts were extracted, but the presence of malicious URLs suggests an attempt to lure users to harmful content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/strik?utm_term=dtr%2527s+laser+shop
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/nadujuvorimev-jimifeti-gokubusijep.pdf
    • https://bojojibapofaz.weebly.com/uploads/1/3/4/4/134478515/magali-namarakakexow-rerofo-nesugimaxa.pdf
    • https://buwutele.weebly.com/uploads/1/3/4/4/134450545/tuwivosov.pdf
    • https://nanupubixo.weebly.com/uploads/1/3/0/9/130969545/3963453.pdf
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/5792387.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf372fa04221c71e5febb/1606284146992/35198834456.pdf
    • https://static1.squarespace.com/static/5fc362cf5687f52b6b9115bf/t/5fd1a0ab1693665fc7ce0cbf/1607573675883/egg_noodles_calories.pdf
    • https://static1.squarespace.com/static/5fc5475712facd59cec9dbbd/t/5fd1889cfec2791e31ffb1b0/1607567517086/despacito_piano_tiles_app.pdf
    • https://s3.amazonaws.com/tomamujuf/ginajikenak.pdf
    • https://static1.squarespace.com/static/5fce64aa0ee49e251fe8d005/t/5fd70748034a586a4f5a6727/1607927624306/29247471200.pdf
    • https://static1.squarespace.com/static/5fc78bb4161f8068becf173c/t/5fd6fad9de5b1220c0407909/1607924441476/chota_bheem_cartoon_picture.pdf
    • https://static1.squarespace.com/static/5fc7828bd8e4f44799675b34/t/5fd0ece5ee69121868507fea/1607527658997/rolotif.pdf
    • https://s3.amazonaws.com/vutame/33502950271.pdf
    • https://s3.amazonaws.com/tosego/maplestory_m_phantom_skill_steal_guide.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_off0000c684.bin
831c72dbe1bc3097baeb5a1cc1bfcfcc1938e8537b9ca0d8333e349819feb643		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC684 4940 bytes
font_01_sfnt_off0000d751.bin
6c446059a44970e12ce3e42808ec19ef3cecb3ba08e82c5ed7323d090af05ab4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 10664 bytes

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