Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d774cab7bd01998…

MALICIOUS

PDF

33.8 KB Created: 2020-11-02 03:29:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5da32f8fd24c66be5a3e3b0810e5324a SHA-1: 9f6507608ecad48246822678dfd12bafceedd75c SHA-256: 4d774cab7bd0199863f35cc3c565653900bcf8dfc5b36a217bb52b8a17f3900c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://ggtraff.ru/pify?keyword=scale+factor+worksheet+kuta+software In PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/waxapigolotubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409103/normal_5f9502537ee50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f8afbfdaaa84.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/zitanigojokizikiwij.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/wepezuwodu-fivusosi.pdfIn PDF document text
    • https://xonimitofowe.weebly.com/uploads/1/3/2/6/132682232/1376720.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/a6f258d0-754d-4b3f-ba45-bd4397efa056/brother_laser_fax_super_g3_2840_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/209470af-7903-42d4-aca7-c347b3dcae0a/the_big_white_2005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d614fb2e-49ec-4526-9fa3-7104e5a44bd2/cheat_engine_binding_of_isaac_rebirth.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/56133083560.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/dewen.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/castellan_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e90beb7c-d30b-4605-ba4e-b1134e2b00bd/mutakizitamezadizibedam.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_off0000494f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x494F 5228 bytes
SHA-256: 2816e584ea293b196f432550d3ee492b80af73bf7a2e48fdb702565331c5ab54
font_01_sfnt_off00005b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B29 9132 bytes
SHA-256: 048d6911d2f0aacce5da984b0850bfdb85f96e6c26b418383b83a8c1905141d5

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