Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c89037e9bf3099b…

MALICIOUS

PDF

71.3 KB Created: 2020-12-20 07:07:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 873129701e1221729557a74cb83f3237 SHA-1: 1cf190fb06516e1b1db0993dffb05c54e5524386 SHA-256: 3c89037e9bf3099b16957268642cdc4f8bb8fa2b7795ca78645fff4da5da09ab
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://gettraff.ru/strik?utm_term=causal+loop+diagram+example'. ML classification and ClamAV also flagged this PDF as malicious. The embedded content, though heavily obfuscated, suggests an attempt to lure the user to the malicious URL, likely as part of a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/strik?utm_term=causal+loop+diagram+example
    • https://static.s123-cdn-static.com/uploads/4386349/normal_5fcc9492a21cc.pdf
    • https://static.s123-cdn-static.com/uploads/4370762/normal_5fcbf40b75714.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/67b02dcd-c578-490f-9dba-c2b76457c6b9/4453482248.pdf
    • https://uploads.strikinglycdn.com/files/768057d5-aee2-4086-bbbb-f473f7cb37b3/gobobujavarapepokokijun.pdf
    • https://static1.squarespace.com/static/5fc529d86609fd0ee7ad3c2c/t/5fcf656757846c5b8355f621/1607427432657/disney_princess_dress_up_shoes.pdf
    • https://s3.amazonaws.com/lejivugeleguwod/85526208548.pdf
    • https://static1.squarespace.com/static/5fc10a34403f5353fd968438/t/5fcb07c2a51c5a1401a29480/1607141316214/jagiwaxatejuzewepi.pdf
    • https://s3.amazonaws.com/nakevoja/via_dolorosa_sheet_music_violin_free.pdf
    • https://s3.amazonaws.com/zodawanuror/2862740061.pdf
    • https://uploads.strikinglycdn.com/files/bb735c51-2f93-4c58-9bf7-ec4d41acd8c9/48570543003.pdf
    • https://uploads.strikinglycdn.com/files/377cb81d-4df2-4089-8ac5-ff282d19bb55/gusep.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_off0000da85.bin
4382e7b5c787f63348291b4fe0420fd4ea238e5c5579ea320846fa42df682a5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 5252 bytes
font_01_sfnt_off0000ec4f.bin
7aedc9e8a566cb7972d11be9f95d65f8c460130cab5ca9dcbd327e4808f09836
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 10680 bytes