Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb39f9ff63ef14d…

MALICIOUS

PDF

73.6 KB Created: 2020-11-20 19:29:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fc267ff3d0851fb3f8a4ac92f7f71d9 SHA-1: d5ac469e8b3bb61a244c4b8401d1c3c1fb54bc0b SHA-256: 5cb39f9ff63ef14da90910d9fbb59c63f093923e6efc878afb5463ffbecea1b7
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://traffmen.ru/123?utm_term=minecraft+lord+of+the+rings+mod+curseforge'. This URL is likely used to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains strings related to Minecraft mods, suggesting a lure to entice users to click the malicious link. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/123?utm_term=minecraft+lord+of+the+rings+mod+curseforge
    • https://cdn-cms.f-static.net/uploads/4370744/normal_5f8c15b91c185.pdf
    • https://cdn-cms.f-static.net/uploads/4459059/normal_5faff060d3d47.pdf
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f8b4cfa47247.pdf
    • https://cdn-cms.f-static.net/uploads/4383582/normal_5fa77cb76249f.pdf
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5f892b5bcac3e.pdf
    • https://cdn-cms.f-static.net/uploads/4369796/normal_5f96a14e0e732.pdf
    • https://cdn-cms.f-static.net/uploads/4368225/normal_5f8a6f0194f4e.pdf
    • https://cdn-cms.f-static.net/uploads/4493867/normal_5fac329274816.pdf
    • https://cdn-cms.f-static.net/uploads/4414339/normal_5f987d9b7c894.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c7bfe197-6b3c-480d-a380-4ca7db714a93/68789233257.pdf
    • https://s3.amazonaws.com/pajeriramal/cpc_exam_prep_study_guide.pdf
    • https://uploads.strikinglycdn.com/files/c793de5a-33b2-4632-a939-31232b132920/77970193000.pdf
    • https://uploads.strikinglycdn.com/files/e79428d0-75f8-4376-83a2-b9a39221cb7f/bidesupevuxuni.pdf
    • https://uploads.strikinglycdn.com/files/5e58ffcf-c371-4c6d-8f59-2b9872380840/runepimadezu.pdf
    • https://uploads.strikinglycdn.com/files/036039aa-e3ff-40f4-8ff2-0def81e7e2ab/penpals_tell_me_why.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_off0000e276.bin
2f0350fea1a6365e1f70ed9b4b37a2f55525aeee7234acee3abb67ffaa272b36
pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 5440 bytes
font_01_sfnt_off0000f4d8.bin
f69fd058d4d245a6d6edddd64af1c5ab599631c1c84963bfed2f39432de84003
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 10760 bytes