Malicious PDF — malware analysis report

Static analysis result for SHA-256 780992bd331f1f5f…

MALICIOUS

PDF

115.0 KB Created: 2021-01-09 17:04:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 53217adbc0a9784b88fe43fcb2a06ba0 SHA-1: 7cae9e2d2439e076ac80f88581f25cae8ba0f810 SHA-256: 780992bd331f1f5fc542a1b23c139957027666420a5e5b26fc9984b0f74d93fd
174 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 a malicious redirector link pointing to 'cctraff.ru'. Additionally, a callback lure heuristic suggests a phishing or tech-support scam pretext. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL and the nature of the heuristics indicate a phishing attempt designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://cctraff.ru/123?utm_term=georgia+southern+calendar+of+live+events In PDF document text
    • https://cdn.sqhk.co/rowavarop/Afdhbjf/viral_group_dance_videos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393511/normal_5fd89594284c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372737/normal_5fcaa0ce2dd80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403679/normal_5fd9d4da2d891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446285/normal_5fa39d1657ec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f900330cf3c1.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/zo2mhcS/15964670915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5f8864a9090d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374178/normal_5fe3e87042b2f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/37cefdf3-b1ee-4128-86db-cfbdeb603014/bell_high_school_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aece90ef-aa27-4766-b6aa-810c051be358/dadasupirulakusejiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a003c739-b9ec-4769-9a1f-10924ce15a9b/nurofiwozurenebixowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0216137b-74a0-45fc-b240-eaefaa6fa052/bernt_bodal_net_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73ad5caa-aab5-4d0c-96c6-446f262af0e6/vurigexejeroxebawewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5cecdb3-8712-48ad-8a32-738589f98abd/70280716978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/637551c3-c324-4556-abe0-c9675526c833/south_park_s18_e3.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_off00017de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DE7 5376 bytes
SHA-256: d9f4c466a9f88f1204ccd84e47a719094f9e52d44362713a5308a9149cbebf7e
font_01_sfnt_off00019033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19033 14832 bytes
SHA-256: f19e174f9133645c538374f816944b8043086854d25c97b6f7970e03a9e66606

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