Malicious PDF — malware analysis report

Static analysis result for SHA-256 487c42ea2ff6787c…

MALICIOUS

PDF

80.7 KB Created: 2020-12-31 15:20:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19e3e5a30e486cb790631a7aec3b66e3 SHA-1: b8ce0f1ce3169ad5cc9a7508d7b0c1ae6e8a20e0 SHA-256: 487c42ea2ff6787cbcbf358abe4d2e490de3ba7587fa8166e2b4ecaf2239d37e
222 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 'https://gettraff.ru/strik?utm_term=big+fighting+game+mod+apk'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, one of which is 'https://s3.amazonaws.com/zarusegibitumet/vavazipagoxolugog.pdf'. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the presence of embedded URLs and the malicious redirector strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=big+fighting+game+mod+apk
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/sajak-zuruvafe-dipoma.pdf
    • https://cdn.sqhk.co/lixozimiz/hghihcy/71824180799.pdf
    • https://cdn.sqhk.co/vuxesojogugu/ighiggD/19135628505.pdf
    • https://cdn.sqhk.co/ditetona/icHPjbO/best_drum_machine_vst_2018.pdf
    • https://jesipawuba.weebly.com/uploads/1/3/0/8/130874316/48f9e150ba8.pdf
    • https://nenopejir.weebly.com/uploads/1/3/4/6/134603535/xixinafojofeku.pdf
    • https://cdn.sqhk.co/gitopedevid/rgejbgj/wosapetexugumazisolona.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zarusegibitumet/vavazipagoxolugog.pdf
    • https://uploads.strikinglycdn.com/files/57691825-2c3f-40f9-aa74-e7425b60d5af/wazefavimolugadidotenanov.pdf
    • https://uploads.strikinglycdn.com/files/4035ffd3-c74e-48d5-b8d8-f77e21589f9d/2011_hyundai_genesis_owners_manual.pdf
    • https://uploads.strikinglycdn.com/files/fc4e669a-e692-4475-b9a4-5e2dca6c3ca8/space_station_13_colonial_marines_guide.pdf
    • https://s3.amazonaws.com/dinigugaxej/white_mermaid_dress_wedding.pdf
    • https://uploads.strikinglycdn.com/files/802a9e64-571f-4258-90d7-10f8f4d52a7f/linapuvawipomiv.pdf
    • https://uploads.strikinglycdn.com/files/8c371684-6bb9-4c12-b53b-0932a78987e8/xefawevi.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_off0001008e.bin
899382175b35f664c63cc570b235f69302ceb3b2eb6a0438bfee95f0b838e06a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1008E 5264 bytes
font_01_sfnt_off0001125f.bin
03ae93336a7f81d3bcec31a560226fb5a14bcc51898f9b5eb118666adbfef909		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1125F 10348 bytes

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