Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4abf85cb95785a…

MALICIOUS

PDF

71.7 KB Created: 2020-12-26 06:40:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0bd62ff483fbf5368fd6d848bb5fdae9 SHA-1: 374fc18d4a0176b46ca7c68d936d3b652ac5997e SHA-256: ad4abf85cb95785a19bdc65de99176ced3b9d509b0b944d832e618800ed1a8f0
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and heuristics indicate it contains a link farm and redirects to known malicious infrastructure. The embedded links, including one pointing to 'gettraff.ru', suggest an attempt to drive traffic to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://gettraff.ru/123?utm_term=exploring+the+renaissance+quiz+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f92c9aa1e3e3.pdfIn PDF document text
    • https://paweweribawu.weebly.com/uploads/1/3/4/6/134656346/xurisozaje_texuwaw_timirive_berotugugulap.pdfIn PDF document text
    • https://cdn.sqhk.co/puburasar/SCx6Q63/21351614003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411708/normal_5f95fa1c7276e.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesiwafo/8ieicB9/call_of_duty_zombies_unblocked_download.pdfIn PDF document text
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/8845368.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f15c5322-426d-4b27-b833-4c96d7955bfb/25249712354.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec5b29da-9ab8-4a21-9173-3d8e3d6504bb/71633344496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64641325-9513-4ce2-a26b-cbb2616baa8c/sams_teach_yourself_sql_in_10_minutes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24663d31-06d5-4529-a475-917cee4f78af/71709215810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24026d37-1ad6-4261-a0f0-3eb31bc7f830/safoweni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93c98a67-1cf3-4dac-b2b0-19199daf4cc6/jeepers_creepers_cartoon_1939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4ff3b30-ee44-4dd1-a93d-12d6a43581d9/bolenivugamunududem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c2b8e44-bbee-4d4e-9b8b-f51f8ca60ba4/92167241136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/455a37b9-a0f4-4fe4-8c28-f8b8111cf193/answer_key_to_algebra_2_workbook.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB9 5368 bytes
SHA-256: a9178dca2d950322e6dadbdbdf93a7fa5e1104cedc0b3150ce61be9eccf74470
font_01_sfnt_off0000e015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE015 10440 bytes
SHA-256: c79879c24e54faafac0a34779f46abad9bfd3abab4e82d62bc78f75cb775fdb2
font_02_sfnt_off0001039b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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