Malicious PDF — malware analysis report

Static analysis result for SHA-256 2938836fcbc7725f…

MALICIOUS

PDF

81.1 KB Created: 2020-11-24 05:08:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1a447732ee3f87b1582c427420fbe36 SHA-1: 6719924cc62b900d70c45864ff2d029027fa758a SHA-256: 2938836fcbc7725f26e20a50ebbd469eac6024e6b979aa730fae6e7d597f3eda
154 Risk Score

Malware Insights

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

The sample is a PDF document flagged as malicious by multiple heuristics, including a critical alert for a malicious redirector link. The embedded URL `https://traffmen.ru/strik?utm_term=vocabulary+workshop+level+f+enriched+edition` is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the primary threat is the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-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://traffmen.ru/strik?utm_term=vocabulary+workshop+level+f+enriched+edition
    • https://cdn-cms.f-static.net/uploads/4367632/normal_5fa3f1ae9d1e6.pdf
    • https://cdn-cms.f-static.net/uploads/4376849/normal_5f9d181c7365b.pdf
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f86f51255625.pdf
    • https://cdn-cms.f-static.net/uploads/4412174/normal_5f9f82384a027.pdf
    • https://cdn-cms.f-static.net/uploads/4369901/normal_5f8ed1993646f.pdf
    • https://cdn-cms.f-static.net/uploads/4402533/normal_5fa6a9ef253c4.pdf
    • https://cdn-cms.f-static.net/uploads/4406473/normal_5fad82f47b12c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/7fbf3e9f-7c83-471a-bca6-879d5c0660c3/mason_dye_laura_san_giacomo.pdf
    • https://s3.amazonaws.com/dazifozixawus/punaxagefuliroriw.pdf
    • https://uploads.strikinglycdn.com/files/d10d55f2-d464-4d63-a572-2c392ff8b830/damodenebuv.pdf
    • https://uploads.strikinglycdn.com/files/eac0442d-aac8-43bb-9432-2b2a0fdb33c0/honeywell_thermostat_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/aa3f2ae2-cb7d-4010-b372-5cf0f187b142/40527926775.pdf
    • https://uploads.strikinglycdn.com/files/5a4b4315-7b3b-49de-b6a4-237e4dba3e3e/84101937523.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8b0.bin
c4b57b82e6d0ebcef17bd732f0b6ddf200cfc0c1604838bbf5b9b9fb304cd17d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B0 5548 bytes
font_01_sfnt_off0000eb8f.bin
58621d35115b9ee9368488b28feaee9bc71267a715f6686fb5b81a5ecfeab4b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 9672 bytes
font_02_sfnt_off00010cf4.bin
f29cff836c99e10f9209b652af06445c71f7b1b4cd7e7c08b355559cb112f523		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF4 18396 bytes
font_03_sfnt_off00012916.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12916 4324 bytes

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