Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f84e536e2dba80…

MALICIOUS

PDF

78.4 KB Created: 2020-12-27 08:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ca09a55927babcc2472a4bd9e18c01d7 SHA-1: 7b22d8f159c60cd507f7158d0a6255b011fe7647 SHA-256: 31f84e536e2dba80f9888050c328a755ab719a1a2e417f4f68df9d9f11d6c487
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, directing users to potentially malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to traffmen.ru, indicating a redirector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/aws?utm_term=hollywood+action+movies+in+english+free In PDF document text
    • https://namazowofurap.weebly.com/uploads/1/3/4/3/134372349/nakefidow-derow.pdfIn PDF document text
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/9183877.pdfIn PDF document text
    • https://gijakumode.weebly.com/uploads/1/3/4/3/134306186/d57554c320.pdfIn PDF document text
    • https://zewubonorow.weebly.com/uploads/1/3/1/3/131398185/716227b6a9e.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/ZrUeejb/barber_shop_golf_course.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/6cd810db-0879-452b-bb70-404c7fb28276/ib_study_guide_biology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15c7e24c-0e54-4240-a50e-fd4511ffdc11/free_kill_the_dummy_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5263ab7f-f40f-4692-a569-34714173b2da/lisaravitezapamusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/699ded18-bfd3-49e5-97a1-2aaf42bed40a/watch_spider_man_homecoming_free_123movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d031494-8bc6-46ca-9e6a-c7f8e3d83d07/free_photo_transfer_app_from_pc_to_ipad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6095f84d-a2c4-4c0e-9ceb-9f3d58782b44/75483075086.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/94483683461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef5749be-1f3b-44b0-b9ba-69e172ba6eae/45794227387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ad00c55-1d6c-4d17-88f7-6514492eda51/30671327234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b21a79-18b7-4f07-958b-d847255a7524/gavunejuxi.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_off0000f5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F8 5648 bytes
SHA-256: df1a18a0322eea9ce26684915f7bc7fffb10fa2be6703d70d5091b14036fdd22
font_01_sfnt_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 10288 bytes
SHA-256: a30eccbc64c8f2adfa66159a1f8ed4540944022084cb722b806a4e01fcf83717

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