Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f6b87875698429…

MALICIOUS

PDF

64.0 KB Created: 2020-12-17 20:31:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 4f2a97deff39cc72667a0d7d405a878a SHA-1: 8bfcb446ec44de782a94a54d9266c4e53269defe SHA-256: 41f6b87875698429681b8a44005464df05334f3923aaacd92c61ce48a3aa1b42
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'traffine.ru'. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of external PDF links, with one example being a link to a 'farming_simulator_16_mobile_download.pdf'. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://traffine.ru/strik?utm_term=hammer+build+mhw+iceborne+reddit In PDF document text
    • https://static.s123-cdn-static.com/uploads/4530990/normal_5fd0745cd391d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416796/normal_5fa01a369f10b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426699/normal_5fd132b83eee5.pdfIn PDF document text
    • https://bolumuratojepo.weebly.com/uploads/1/3/4/7/134749128/aed7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413575/normal_5f9d74df479e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5c475c89e1c4b8fdffacc/t/5fccda2b24c49707d31e7cba/1607260716552/farming_simulator_16_mobile_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc115bd5e8e827d428ee316/t/5fc16fff9d79364840c3bb0c/1606512639931/zokujak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a2d9ad4-df05-4838-bf5c-2a5f33f0735f/rate_of_diffusion_units.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc53768bf71053ccb2bf618/t/5fd1a9f2b0f0f842d7a3a323/1607576056660/dragon_ball_super_intro_2_lyrics.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc783e939503a47f6fdd85a/t/5fc7e040e6f2ed3f50df0e62/1606934593268/world_of_warships_blitz_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9364002-07d9-4780-81c1-45aae8c53650/68201421517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72317376-b619-426f-a5c9-154aa95a8f40/jivixoderisiwopegijesux.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc79396d2523e4b70c2aa72/t/5fca01e79309303fb8360e91/1607074280401/need_for_speed_no_limits_pc_specs.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_off0000ab89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB89 5192 bytes
SHA-256: bf5987923979c6e12a95e642d05c275f2bc4802f0bbbcb90ca8f13a4014433af
font_01_sfnt_off0000bd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD10 9924 bytes
SHA-256: 43cc721ea316a9be73c1b456608871841965462cc2b4b0a1d270e0af865e20f7
font_02_sfnt_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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