Malicious PDF — malware analysis report

Static analysis result for SHA-256 abfb55f9c717f559…

MALICIOUS

PDF

74.2 KB Created: 2020-11-14 15:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 54e3d94915ed0919f5e751278293c992 SHA-1: 937c90bc22bc053b419bc4e80dc7c25ffa16a6b8 SHA-256: abfb55f9c717f559e57679808cbb5a77b93a900a2d4839ca2128491eb91033e9
162 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 'https://cctraff.ru/123?utm_term=final+burn+alpha+psp'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector link suggests an attempt to lead the user to a malicious site, consistent with phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://cctraff.ru/123?utm_term=final+burn+alpha+psp In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5f9da2d3e9fc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f9688f6e4910.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/sesakaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451350/normal_5fa4d5781f590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387571/normal_5fa9017e7c87a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371508/normal_5f951de97be2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410441/normal_5fa7ac491fbcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451044/normal_5fac084991f01.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/0b5a4ed4-4e4b-4dda-a9b5-988eb7953e01/ap_bio_lab_1_diffusion_and_osmosis_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338aeb0e-c49e-4e2c-a7bc-bb15941dd6ef/homer_jr_high_pto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8efd2b4f-2e6d-4a67-8029-cbc9cabff7a8/kadelajurafamimuganeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1595289-a149-469d-93e1-ee8a9ab52435/miledoturalopivo.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/82612370827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8939d8b7-3d18-4bf9-924d-387dc9ab319a/85876173045.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/summertime_saga_mod_apk_pc.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06B 5000 bytes
SHA-256: 43a55048cb1b52d17417fde1db87cae76951a8929d9d6d1b2ed15e2cdcfc8c1e
font_01_sfnt_off0000e160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE160 10676 bytes
SHA-256: 31bf39c8b272175d5c1dd8ef2287a446164d2633d7d2c485249fb9e6fbfe6707
font_02_sfnt_off00010622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10622 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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