Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84b1e576e81cd87…

MALICIOUS

PDF

47.9 KB Created: 2020-10-03 13:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7d2f247d3d5c140fb686e90a6f23782a SHA-1: fd58d0e472944ae6f5bf9113f3d2d27f1e3ea3ef SHA-256: f84b1e576e81cd872b6c80a5cc1085b576cd6e3c5f60b3143c49ddd8700f0c6c
154 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 sites. One such link is a known redirector, and the ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic findings, suggesting a coordinated effort to drive traffic to external resources.

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://gettraff.ru/pify?keyword=can%2527t+let+go+geometry+dash+music In PDF document text
    • http://files.greatnwsoupcompany.com/uploads/1/3/1/4/131452867/2387365.pdfIn PDF document text
    • http://wexov.pfrangassociation.org/uploads/1/3/1/4/131407005/1766089.pdfIn PDF document text
    • http://jotojo.shannoncothrenphotography.com/uploads/1/3/2/6/132682697/cd2584188.pdfIn PDF document text
    • http://files.petermiyamoto.com/uploads/1/3/1/4/131453252/20c293da8e24.pdfIn PDF document text
    • https://site-1040124.mozfiles.com/files/1040124/90097638958.pdfIn PDF document text
    • https://site-1037207.mozfiles.com/files/1037207/xomodixasidixija.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/18366a9b-65cc-468e-8c86-784b2930f3ad/vatosojufoligeju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27f90e96-7efa-46c3-8f8c-d68364cd59bf/43816476287.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/3086/1208/files/malefic_truth_dragon_tips.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7428/0855/files/crossy_road_wiki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1976/9755/files/geometry_section_1.3_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/2982/7231/files/minecraft_1.6_4_crafting_guide_mod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4077/5071/files/77638530442.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58DB 5396 bytes
SHA-256: 8f2fc3a2385cfa2e18339557fe3574b4b16f6e3a8244a4838e72755e7a4fcbfe
font_01_sfnt_off00006b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B18 10924 bytes
SHA-256: f0e32efa770857492f02a581ff54afff06c7bd778db74c0ab044a11e5976bbcd
font_02_sfnt_off00008f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F87 16076 bytes
SHA-256: 6b13f8def256235e3ecdb6cd1b4534f0823fff5a25810a35c090d1b32d4fa7c4
font_03_sfnt_off0000a430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA430 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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