Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3068bac4835389b…

MALICIOUS

PDF

46.3 KB Created: 2020-08-11 21:39:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8477e8818fb9a9044980b7858d964ec SHA-1: 401d9e3c94af4da8a1b80176ae89dbb89912e557 SHA-256: f3068bac4835389b8bcdf4de5365578fc28cdb31b8d3d382a4c259eef50b1640
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a redirector to a URL associated with malicious activity. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=auto+body+repair+technology+pdf, suggesting a lure to disguise malicious redirection. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points to a content-scraping or SEO-poisoning tactic to distribute malware.

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://ttraff.ru/pify?keyword=auto+body+repair+technology+pdf
    • http://gomanula.ncce-learn.co.uk/uploads/1/3/2/8/132815002/f0a97.pdf
    • http://files.akitawrestling.com/uploads/1/3/1/3/131383330/lojimimomarisazitu.pdf
    • http://files.junamustad.com/uploads/1/3/2/6/132682471/bedalavuliwimidok.pdf
    • https://cdn.shopify.com/s/files/1/0430/7245/4807/files/89398128562.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7218161301.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/technical_drawing_with_engineering_graphics_13th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0441/4645/8776/files/59777431419.pdf
    • https://cdn.shopify.com/s/files/1/0428/0818/0895/files/79017914337.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/21473661282.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72593533024.pdf
    • https://cdn.shopify.com/s/files/1/0440/6837/2632/files/kaplan_gre_math_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0437/5291/5098/files/36762466051.pdf
    • https://cdn.shopify.com/s/files/1/0431/0342/0570/files/23466212261.pdf
    • https://cdn.shopify.com/s/files/1/0436/1220/9315/files/trimble_tsc3_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/2304/6568/files/33387029420.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069f5.bin
57a2a147664da7f01df7e9d3e835f5a9516ddb5a15e18b8019479f58d3f052b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F5 5352 bytes
font_01_sfnt_off00007c21.bin
e31613feb2d72a2669e81733bd84ee01c34b1d29f4a52832f1db1f39230ac508		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C21 10024 bytes
font_02_sfnt_off00009e82.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E82 4324 bytes

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