Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1f85254c12e8fe…

MALICIOUS

PDF

34.1 KB Created: 2020-09-02 11:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3312a15b413b5889836767099f75ebe SHA-1: 996868cf28be7d846fd44b06b7d1ef585c1b5fe1 SHA-256: 6f1f85254c12e8fe6299aec04acea98016f9e044810f6299d191f15fd9e3cbbf
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for movie-related content, likely to entice clicks. The PDF also contains a large number of external links, many pointing to benign Shopify URLs, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wix?keyword=arjun+reddy+naa+images
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3653/1095/files/bharat_movie_song_slow_motion_pagalworld.pdf
    • https://cdn.shopify.com/s/files/1/0434/3103/5032/files/supome.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/tusazatobamixibefumer.pdf
    • https://cdn.shopify.com/s/files/1/0432/2145/0914/files/pofitelitevagu.pdf
    • https://static.usrfiles.com/ugd/01d500_5617975a404e433c898f5dac1bb5e7c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_c24447d30b8c47828084a64ed750a70b.pdf
    • https://static.usrfiles.com/ugd/b8c837_80cac8eeca774c5aaaac7f0051ac1ef8.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2453/files/jobovun.pdf
    • https://cdn.shopify.com/s/files/1/0451/4906/1274/files/simajunewikifol.pdf
    • https://cdn.shopify.com/s/files/1/0433/6068/2139/files/resume_cover_letter_template_for_teachers.pdf
    • https://cdn.shopify.com/s/files/1/0437/0386/1401/files/1288136902.pdf
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/d_d_downloads.pdf
    • https://static.usrfiles.com/ugd/fd30ac_5c2e2057361b4589a4b5f8dee96c7f86.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5cfaea357d74801a4863968279feb0a.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004668.bin
17e3b36ec3728e2791b350640b17e0202e35283e6f04ab7c3da890682ae76ead
pdf-font-stream PDF embedded font (sfnt) at offset 0x4668 5280 bytes
font_01_sfnt_off00005853.bin
adc244342c2f3bae4010215b4c1f5692a2773c72fb57858414bc8017d881cc0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5853 10360 bytes