Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd1081b3d3a3215…

MALICIOUS

PDF

76.2 KB Created: 2020-12-26 23:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 335f7ba3f3f217053bdb56d45a4d3b6e SHA-1: 153f22afd314c59df6262fe735e2b89a59f4d30f SHA-256: 2fd1081b3d3a3215eada3dddcebcca38458f3a8e9f3a61f85c11ed9b21da3716
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics identifying it as a malicious redirector and a link farm. The document body, though corrupted, suggests a lure related to a 'Youtube subscriber booster app'. The presence of embedded URLs and the overall structure strongly indicate an attempt to redirect users to malicious infrastructure for further exploitation.

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-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/strik?utm_term=youtube+subscriber+booster+app
    • https://nokafixawawi.weebly.com/uploads/1/3/1/6/131606940/8233885.pdf
    • https://cdn-cms.f-static.net/uploads/4376852/normal_5f909e681098b.pdf
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5fbca5ebdfaa7.pdf
    • https://diwapaxifok.weebly.com/uploads/1/3/4/4/134488462/vaboz_lovopo.pdf
    • https://cdn-cms.f-static.net/uploads/4388163/normal_5f9d6d024e256.pdf
    • https://static.s123-cdn-static.com/uploads/4493873/normal_5fc5d9eb87ebc.pdf
    • https://static.s123-cdn-static.com/uploads/4482636/normal_5fca6fcff2ad0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/baposivarabuj/90161059456.pdf
    • https://uploads.strikinglycdn.com/files/37a2c31e-ab77-4832-a5a3-e1adebad97d8/53700776710.pdf
    • https://s3.amazonaws.com/wixatax/peet_s_chai_latte_nutritional_information.pdf
    • https://s3.amazonaws.com/mudurixo/excel_tutorial_video_free.pdf
    • https://uploads.strikinglycdn.com/files/a915ac1b-3464-4536-8eb0-f2b401870cf3/firofovebuporor.pdf
    • https://uploads.strikinglycdn.com/files/c2e9ff58-ade4-42bb-817c-427977246a34/kundli_software_free.pdf
    • https://uploads.strikinglycdn.com/files/1acab7b0-b319-4f5f-8980-a29af839b7fb/cub_scout_flag_ceremony_patch_placement.pdf
    • https://uploads.strikinglycdn.com/files/79bc7e23-db73-4d34-9ac5-6cbbd2088494/wedgewood_vision_stove_manual.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_off0000edad.bin
45c53bd3b99c41da8f6c6073faa3e3d33a2e348ab07362b74b4298ebe080302d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 4996 bytes
font_01_sfnt_off0000febc.bin
fb71f623121f5ee86dee159f918ff106e8bcb840154334ee776a275567d29369		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBC 10824 bytes

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