Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfa4bd84c0ceb12…

MALICIOUS

PDF

40.0 KB Created: 2020-09-01 09:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9112297cd2e321c8de07cfbf60258a4 SHA-1: e5d003d518a005082b74ef43cb09f9163a4a67b9 SHA-256: bdfa4bd84c0ceb12ff1015b1fa4d2cb1dbba0374a1c8d61f88ffe977e7d9f529
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to benign Shopify URLs but one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is sheet music, likely a lure to encourage clicks. The primary malicious URL is https://ttraff.me/wix?keyword=liebesleid+violin+sheet+music, which is flagged as a malicious redirector.

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.me/wix?keyword=liebesleid+violin+sheet+music
    • https://cdn.shopify.com/s/files/1/0437/1293/8152/files/balloon_arrow_game.pdf
    • https://cdn.shopify.com/s/files/1/0428/2328/6951/files/85744695135.pdf
    • https://cdn.shopify.com/s/files/1/0432/5919/9650/files/bajrangi_bhaijaan_songs_pagalworld_video.pdf
    • https://static.usrfiles.com/ugd/0c4177_a69efb5893aa4d9a93f83b5038622df1.pdf
    • https://static.usrfiles.com/ugd/ef253e_49c4f117513f4362a2075a19239bee48.pdf
    • https://static.usrfiles.com/ugd/3826db_e449426c3cd845e293db836e469104cc.pdf
    • https://static.usrfiles.com/ugd/dd4472_a44546e3bd0b4a0284671e0724158b7c.pdf
    • https://static.usrfiles.com/ugd/10b11f_dcdda8ae3a77412abf6ffc311744b2f7.pdf
    • https://static.usrfiles.com/ugd/0dd040_681598e0b5b843ef868815a723141962.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1585/files/zesuxofabusofubepibiri.pdf
    • https://cdn.shopify.com/s/files/1/0431/4379/0760/files/4700615607.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_off00004ab0.bin
d74c6699f3387c1ce906bd43097ea0205f688072faf948a809b5ca1330202c0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AB0 5016 bytes
font_01_sfnt_off00005ba3.bin
0192123054c2955f46a67aa141497154a1abd7acb7166193b348f19683955a98
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA3 10076 bytes
font_02_sfnt_off00007e79.bin
9cfb948b915a4694feeb7f8719f2b65905b0a58e2ed918074a610570d07e7249
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E79 16100 bytes