Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa1370241dc83ea…

MALICIOUS

PDF

96.8 KB Created: 2020-12-20 12:13:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 366c94c2ebbf74f9f5b5c1105887ac4a SHA-1: 1e0d96d0141a58cf9c383f4243238916cce820a7 SHA-256: 3aa1370241dc83ea23d62350d4dc13884bcd8aa84dceda03ad3b8d77acb396dc
234 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a malicious redirector pointing to 'https://gettraff.ru/strik?utm_term=coc+private+switcher+download+apk'. The document body, though heavily obfuscated, contains text related to downloading an APK, suggesting a lure for potentially malicious software. The presence of numerous external PDF links, including one to 'https://s3.amazonaws.com/zosevid/75468672688.pdf', indicates a link farm strategy, likely to distribute or obscure the malicious destination. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=coc+private+switcher+download+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387224/normal_5f93d7f96015e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387810/normal_5f9ba4789ffd9.pdfIn PDF document text
    • https://mesaxejako.weebly.com/uploads/1/3/4/0/134097573/0f65b7615.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/zosevid/75468672688.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/sbi_corporate_card_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/vurivuzafunedovif.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/free_blank_paper_to_write_on_online.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc115278ef7301f8b11bee7/t/5fce982a5b1d5f2ceb67854f/1607374891012/91238412706.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcec0d722ab2636325f129d/t/5fd722fcb1c3f31c7a9b078c/1607934717241/47135450748.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/arachnid_cricket_pro_650_electronic_dartboard_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/29258541128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42aaa266-c61a-4f4d-a318-40480b1aa29e/19960683175.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_off00013d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D66 5284 bytes
SHA-256: b1d95486a3668d6f7321810251eb7d8593645df7184edd29afcbef75bef5e049
font_01_sfnt_off00014f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F61 11468 bytes
SHA-256: cc3266e38b2698979dad9ffcd2ad83e6984529120dc2d29729071ad1849f0d7f

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