Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa9a9fb1ba7f747…

MALICIOUS

PDF

74.0 KB Created: 2020-09-01 17:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfd0d87372b61c001d106a42aba78ffc SHA-1: 10c53ac9ca398b9af938884dd05b9d9ae33630f3 SHA-256: bfa9a9fb1ba7f747081b846ec5bf73ffc73a43f80a07bc3a78e0c3d30eab5e1a
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The embedded URL points to 'ttraff.ru', which is associated with malicious activity. Additionally, the PDF exhibits characteristics of a link farm, with numerous external links, suggesting an attempt to distribute or redirect users to other malicious content.

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/wix?keyword=fallout+wasteland+survival+guide+mirelurks
    • https://static.usrfiles.com/ugd/b8c837_503930efaa134338ab701eb24487daf0.pdf
    • https://static.usrfiles.com/ugd/0a0016_f0fbdae800bd424cbac504ef68f14578.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6247f754daa4a7dbd816da461b6224e.pdf
    • https://static.usrfiles.com/ugd/299074_490da7e71c8042b1aedf37ef235aedc2.pdf
    • https://static.usrfiles.com/ugd/b8c837_41d861efb37249c79c5cdb82e032f555.pdf
    • https://cdn.shopify.com/s/files/1/0434/8539/7152/files/nozijivep.pdf
    • https://cdn.shopify.com/s/files/1/0438/9827/3944/files/29305022055.pdf
    • https://cdn.shopify.com/s/files/1/0431/5552/1695/files/nulowugedozesugoso.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/dilixerudakax.pdf
    • https://static.usrfiles.com/ugd/850f07_dd29c780982e4c52b2c9232e90c5d16c.pdf
    • https://static.usrfiles.com/ugd/db1da1_d5c67692b74840abaac0c132311c4487.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c283542dd054f8287c4545160b60715.pdf
    • https://static.usrfiles.com/ugd/fbcb80_f8b5d46bfea04c29b5e99e5bd6240cdd.pdf
    • https://static.usrfiles.com/ugd/7ef0dc_0cd750cc9f034c739364aa8171279943.pdf
    • https://cdn.shopify.com/s/files/1/0432/4062/0200/files/35948344063.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6016/files/pifoxuxofexemupijafis.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/25187910135.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd30.bin
a3c1d404d7545f256bb9e178be581b230345a91ded0f5cdd271c1ce19aef122f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD30 5316 bytes
font_01_sfnt_off0000ef4e.bin
db6251b5c4977956fe2919875df2f832cceef3aa3aa06c885d7817a4aba943a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 13348 bytes