Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f2060f1b46e0d0…

MALICIOUS

PDF

73.6 KB Created: 2020-12-17 22:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 99cdb63d0e1f874176f385fdb61291e5 SHA-1: 04f92d1f9975b9e2260bf2a02cec057786b32e6d SHA-256: 77f2060f1b46e0d08cff79ee82321283c23cd77c6b0ee4a4dea2d8acdfdd7fb7
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://gettraff.ru/strik?utm_term=i+think+in+texting+language'. Additionally, a machine learning classifier and ClamAV both flagged the file as malicious. The document body, though heavily obfuscated, contains text that appears to be a lure, and the file's structure suggests it's designed to exploit PDF vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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?utm_term=i+think+in+texting+language In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383804/normal_5f932e8a53f99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489588/normal_5fb4b2166a054.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jijumupade/waves_test_answer_key.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5de0c2bbd7406582891ec/t/5fd007398953eb050002607d/1607468858748/4169609737.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e88b8139af0376454bd0/t/5fcce023f94b6402b219d7e5/1607262243514/harkins_theatres_tucson_spectrum_18_tucson_az_showtimes.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/victrola_model_vta-600b_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/nimufijowikugom.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b6ff81da8a590db25819/t/5fd0ae9a12264b5dfdd1d8b6/1607511707909/brain_test_game_level_42_solution.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/kemarufag.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/zoxuvufalu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0cd9260f2895dc1e75cb0/t/5fc2b0ca5147b148048b250b/1606594767646/strategies_for_effective_transfer_of_learning.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/ankle_fracture_rehab_protocol.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc172dc1452f90b7fe9340e/t/5fcc79c61e1a4d7de12387c9/1607236040784/99192591724.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6251645712565432c031/1606378066038/johnny_rebel_in_coon_town.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/wajozepaba.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_off0000e44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 4744 bytes
SHA-256: 19b333db7d7de1bdf2ac645b6c4a601d22fae91e3fa7beb5ec91476a488884fe
font_01_sfnt_off0000f473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF473 10684 bytes
SHA-256: 7300a3ae5ce19d431afe92371565de3a53276c9a7cfc0bed09c77bc7a4079695

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