Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac65ded656ce63b…

MALICIOUS

PDF

68.5 KB Created: 2020-12-18 04:58:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 147f038aeb66251996d9de1fd3132a12 SHA-1: 5d502952a0ab1e23be4edb1e8d78555f138d65b6 SHA-256: aac65ded656ce63be4dd7a36b139c14cc20d57186306a4707a582a7e5968ab5a
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of numerous links, including one pointing to traffmen.ru, indicates an attempt to direct users to potentially harmful websites, likely for phishing or malware distribution.

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=shadowrun+5e+samurai+guide
    • https://cdn-cms.f-static.net/uploads/4369671/normal_5fbf0947477a0.pdf
    • https://cdn-cms.f-static.net/uploads/4393016/normal_5fa2dceada7be.pdf
    • https://ludopugadataz.weebly.com/uploads/1/3/4/7/134709803/6cbec685c3c.pdf
    • https://cdn-cms.f-static.net/uploads/4378381/normal_5fb416a5625cc.pdf
    • https://vajipexinonadol.weebly.com/uploads/1/3/4/0/134096003/fiduzaton.pdf
    • https://gadevonetikob.weebly.com/uploads/1/3/4/3/134358307/451ea0800b.pdf
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5f8d93081822c.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/lukuxaluk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc7915fc2869f0c81c3f745/t/5fd0139810495c0ba919bac8/1607472025181/hachiman_anime_season_3.pdf
    • https://uploads.strikinglycdn.com/files/bb35ed17-4862-4420-b40a-be87c0351810/fantasy_footballers_start_sit.pdf
    • https://s3.amazonaws.com/tosego/15070517679.pdf
    • https://uploads.strikinglycdn.com/files/2980be7d-08cd-4f36-b4fe-41d59454804c/partido_de_chivas_hoy_en_que_canal.pdf
    • https://s3.amazonaws.com/lupebesu/aiguilleur_du_ciel_formation_suisse.pdf
    • https://uploads.strikinglycdn.com/files/375f5a2a-11c3-4b83-909f-9a77d1061747/dtop_gov_multas.pdf
    • https://uploads.strikinglycdn.com/files/6b84cbd2-dfb1-4b1c-b831-e4ea4ecffb12/duval_county_school_calendar_2022.pdf
    • https://static1.squarespace.com/static/5fc39d206b97992eb56cd759/t/5fca462b887b444c61624440/1607091755285/indoor_go_kart_race_track_near_me.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_off0000ceb8.bin
df544103b7125dfdd5c96c37e557fafc1f4c7a0ebe55c6010c00e660a20f3c24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB8 5524 bytes
font_01_sfnt_off0000e16a.bin
99026f426b1b35fd82d026886289d51b577031af98b6a3e0a70ae0e43da665bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE16A 10480 bytes

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