Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54b379017b7a490…

MALICIOUS

PDF

109.7 KB Created: 2021-01-02 20:05:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cbd094f06ae581a4fa6fed6ffc8650d9 SHA-1: 3195f5465f67c5c6a90d58a34b811ad7d15bd074 SHA-256: c54b379017b7a4909d54f4e8364d9b80aeb499b89a1c31bb9757c72af2ef12c8
234 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'gettraff.ru'. It also exhibits a PDF link farm behavior, with numerous external links, one of which is to 's3.amazonaws.com/sorapobuk/melanoma_excision_biopsy_guidelines.pdf'. The document body, though heavily obfuscated, contains references to 'game of thrones conquest cheat codes' and authoring application details, suggesting a lure to a malicious site. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/123?utm_term=game+of+thrones+conquest+cheat+codes In PDF document text
    • https://cdn.sqhk.co/xasakeza/dkhhiaN/the_zombies_tell_her_no_guitar_lesson.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454422/normal_5fc4119436f66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402297/normal_5f9b16b97ba07.pdfIn PDF document text
    • https://wixewolo.weebly.com/uploads/1/3/4/5/134577565/burekabawivuf-senozokidolobad.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/sorapobuk/melanoma_excision_biopsy_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/rilaluwoxige.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/lobazesax.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/chaar_sahibzaade_full_movie_720p_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/transformers_bumblebee_blitzwing_death.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f1c059-24d0-452d-85d3-96f50d74aa0b/3011704762.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/mendelssohn_violin_concerto_e_minor_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/4427249025.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/2018_dodge_ram_3500_diesel_manual_transmission_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/21357527518.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_off00017086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17086 5384 bytes
SHA-256: 795975ecf6dc15441c0cfb20840c87beecfd59de5317f1a6239c8e67a0113312
font_01_sfnt_off000182ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182AE 11700 bytes
SHA-256: b4747cea2ce90ed202293c4ac1920bef4c8fe474526bebfc76ff37250b4bd172

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