Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ce32a7f86e976f…

MALICIOUS

PDF

65.5 KB Created: 2020-12-25 17:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 108b52014d4a0d7834b8416507b5227a SHA-1: 7b372e7c0e5648c9ae6ea742ac2736a1b2616e1f SHA-256: 46ce32a7f86e976ff5a8deb1cf7905158f556c9c581d047e8c8838d33740bb6b
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for 'Facebook life apk' and online courses. The presence of numerous external PDF links, including one to a potentially benign resource, suggests a link farm or redirection strategy to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/123?utm_term=facebook+life+apk
    • https://kinefevemupopit.weebly.com/uploads/1/3/4/6/134631160/acdca4f0d2702.pdf
    • https://cdn-cms.f-static.net/uploads/4449187/normal_5fbdc88d5f6f5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/memul/english_course_online_free.pdf
    • https://uploads.strikinglycdn.com/files/0e6f8217-8187-4249-9699-88b0c732ed9a/wolomozakulewijuzixazute.pdf
    • https://uploads.strikinglycdn.com/files/09e7dea7-87c9-4ff4-921f-78931a91f0b7/giganuxosoxodur.pdf
    • https://uploads.strikinglycdn.com/files/c7baec24-d7fc-46eb-a7af-84aa01967c8a/zijaruzerepifofe.pdf
    • https://uploads.strikinglycdn.com/files/f8d87aeb-285d-4984-82d5-7db9152c4939/15541228760.pdf
    • https://uploads.strikinglycdn.com/files/267e7e6c-b3db-4072-ab22-387e10b51c9b/81354115029.pdf
    • https://uploads.strikinglycdn.com/files/a7e51fb2-4a86-43c7-a67b-04b5aafdea70/82457048016.pdf
    • https://uploads.strikinglycdn.com/files/8d4f1550-fe58-43a1-8039-140f4dbbac1c/wentworth_institute_of_technology_academic_calendar_2015-2016.pdf
    • https://uploads.strikinglycdn.com/files/fc3cc30b-3e17-4452-8b1b-7d597743f5f5/war_robots_cheats.pdf
    • https://uploads.strikinglycdn.com/files/3384fbe9-a501-45cb-93f7-d77fd9b514c7/65713831934.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_off0000c564.bin
bd3d54f6b65f01a5672f1aba28d3e31451af893749f8ff4a7162d9160e326412		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC564 4892 bytes
font_01_sfnt_off0000d629.bin
e2c4b44c5d1e7ed5c01230001f1139075a072856823a894fa80d2a07134f6ad0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD629 10816 bytes

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