Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bbca8c5c5c20d6c…

MALICIOUS

PDF

69.4 KB Created: 2020-12-23 12:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 83c37e2fc963912a222d18c8a4c8c053 SHA-1: e9a4dd7d3bbfbe4c33715fc57de8201cf898df1e SHA-256: 6bbca8c5c5c20d6ca631c658b74280d603359a8243e0a5bba4f2216942261a4b
154 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://cctraff.ru/strik?utm_term=arijit+singh+songs+list+lyrics'. This URL is likely used to deliver a malicious payload or phish for credentials. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=arijit+singh+songs+list+lyrics In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_5f92649e7dbf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408471/normal_5f9ca9e2345f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_5f98f9751123b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461484/normal_5fe04f65b2a36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413375/normal_5f9d4ceda5f59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371543/normal_5fc8b7af2700f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455396/normal_5fa4d05776705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377642/normal_5f9bfba24a886.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nujosuwemedadi/inflammatory_bowel_disease_treatment_guidelines_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/faulkner_the_bear.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e098cb99-b372-4bb6-ae12-315c75959221/kepagitejow.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/kagoxuvolibuloposoril.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/lepaxux.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/bafebitedozi.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/fiseda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13a296a4-31b7-48cd-bf68-ccd778550dff/florida_car_title_transfer_upon_death.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC605 4688 bytes
SHA-256: 24482696aae1b67e956cad8d7a5275d888dd7827713f04f03830bca1ef2c91f7
font_01_sfnt_off0000d5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EB 10808 bytes
SHA-256: 39b0d0dcb59879f242e84f21d2cb82076692b18e6749730d3efa157125e8dbd3
font_02_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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