Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbff8d55ab81376d…

MALICIOUS

PDF

44.8 KB Created: 2020-08-31 07:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1321d5df919a0d5af02ae6dd30fdfb6 SHA-1: 1bd930de73753c12beacf31957a0a04ad36cd967 SHA-256: bbff8d55ab81376db9d4e940b416ba0932f0f1bb237e775d976f8063c6cde8d4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'coast guard advertisement' and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly supports the malicious verdict.

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.com/wix?keyword=coast+guard+advertisement
    • https://static.usrfiles.com/ugd/b8c837_89ba8acef18a416eab540a220f16fe61.pdf
    • https://static.usrfiles.com/ugd/34ec99_901ed51766b847f08cf43938552cb6dd.pdf
    • https://static.usrfiles.com/ugd/f967ac_f8f62f2543944c3dba312d6146f8699b.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed4c20ac26ab43e2b305166b466f6bc4.pdf
    • https://static.usrfiles.com/ugd/de60da_879d25d2274440d9ad6da3d644e35e62.pdf
    • https://static.usrfiles.com/ugd/b8c837_141f0f9e7f1e415c9ec98f0b51bc9b19.pdf
    • https://static.usrfiles.com/ugd/c1de29_9b322e0b256d49ea8ce9097d26f163ad.pdf
    • https://static.usrfiles.com/ugd/9e53d4_ee110d398fcd45c59ff49ad48837ace4.pdf
    • https://cdn.shopify.com/s/files/1/0434/1379/9064/files/22219364961.pdf
    • https://cdn.shopify.com/s/files/1/0439/4817/9611/files/73006140866.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/16136689063.pdf
    • https://cdn.shopify.com/s/files/1/0429/7592/0282/files/24679698602.pdf
    • https://cdn.shopify.com/s/files/1/0433/0517/3147/files/benaam_rishta_song_pagalworld.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_off00005e29.bin
a42449558e359424a973e5067536f6bc42afb165ba8f09bd7e308b4879fc44bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E29 5080 bytes
font_01_sfnt_off00006f58.bin
08679eaf66173583a03b472ff84c6f3b5c1fa1554f8ee1d046d43e6213f12580
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F58 9772 bytes
font_02_sfnt_off00009109.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9109 16204 bytes