Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3913dfd04d5cc49…

MALICIOUS

PDF

68.8 KB Created: 2020-11-16 17:25:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3a0ca568434095765443353a6e444f5f SHA-1: 4420742fa5b8805d2960faaf28d0373f61dd42b0 SHA-256: a3913dfd04d5cc490bdb137a45f90b08e97ee0838282ab306683fbab759fa65d
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?utm_term=reddit+nba+finals+stream'. The embedded document body, though heavily obfuscated, contains text fragments suggesting a lure related to 'Reddit nba finals stream'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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://cctraff.ru/123?utm_term=reddit+nba+finals+stream In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393204/normal_5faf7989e2ae9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382201/normal_5fae23adadc2d.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/bededuxotulapil/wonky_donkey_story.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/samsung_galaxy_s6_edge_plus_camera_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/mevefusisadepitixafug.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/zillow_homes_for_sale_new_hampshire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b21f1fe-f8e3-4390-8689-5d549881e88a/ben_10_eye_guy_full_episode.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/boxer_uprising.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/514fa612-346e-4205-b548-75e1dbfd20dc/westinghouse_dishwasher_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/80420822410.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/b._a._m._s_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/tibetan_buddhist_mantras.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/adjetivos_demostrativos_ingles.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_off0000d06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06A 5200 bytes
SHA-256: a160777f4779255fd46e3a285a8ae7945b7f66acba79a8c3ebe5e3bac20acef5
font_01_sfnt_off0000e20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 10656 bytes
SHA-256: 547c457f5448fb29697feeaed956644123e5be2354841ed9c41934d75560dcc5

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