Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12a85c337c79637…

MALICIOUS

PDF

42.2 KB Created: 2020-09-30 01:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 716757f777ec543e349646cb60345e3d SHA-1: 5882ca2bb0e7bf0b67119ae824f8b30c0b009d82 SHA-256: f12a85c337c79637cbac2c1379f9704ffaf219924aa8c53acb50b256a93085b3
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirectors, indicating a link farm designed to distribute traffic. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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?keyword=faa+far+aim+pdf In PDF document text
    • https://site-1037115.mozfiles.com/files/1037115/47510972166.pdfIn PDF document text
    • https://site-1037120.mozfiles.com/files/1037120/50094056188.pdfIn PDF document text
    • https://site-1037115.mozfiles.com/files/1037115/jamurudijudawurufakej.pdfIn PDF document text
    • https://site-1036665.mozfiles.com/files/1036665/rufutofas.pdfIn PDF document text
    • https://site-1037010.mozfiles.com/files/1037010/dulapulezidufid.pdfIn PDF document text
    • http://files.henrikkleven.com/uploads/1/3/1/3/131398605/449f3.pdfIn PDF document text
    • http://tubulepan.trinitymoss.com/uploads/1/3/0/7/130739963/1796750.pdfIn PDF document text
    • http://poxote.frankonfoot.com/uploads/1/3/1/8/131856456/durekafavuvet_gevimovazevesox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b90e26d-108e-4c0a-a243-f8f7123a9cde/ronutulalabedomura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0bf5364-f6ef-439e-9be4-9e79850a0648/4240659802.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07bbf750-88a8-4cc3-8ab7-bf7eb23ccffb/dorewogopopozozixaxofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74596741-0e30-4a4e-916f-cc3a2c77d2f1/vigodagukenabematalop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85a73f31-9d4a-49a7-a962-6f56bbc367d7/petojawimenuzejupip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2a85e5d-6b6c-4147-b113-a6f985486ac0/rogebabumozemupug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed317721-fd51-4757-bb36-c3e31467867b/lelifoboki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b638705-9847-4305-9483-3407ae44cca0/vamebufedeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6e0f8d4-4409-400f-a712-af567de4a361/favubetan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/682355c4-60a2-4be9-89e3-4854946dc12d/19535439615.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6901 4932 bytes
SHA-256: fc1a8951dd138c10ab429bf6206b943497fb4d2bd0125ab84353cf5920729589
font_01_sfnt_off000079b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79B7 10008 bytes
SHA-256: 369bcd50f99014e4251fca7341c614d6ef98a6c99d813b22a9b3dea2d8836a8b