Malicious PDF — malware analysis report

Static analysis result for SHA-256 da231e4140232dd0…

MALICIOUS

PDF

69.4 KB Created: 2020-08-30 12:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0e9c63ee777b363df4a30af7434c020 SHA-1: 035315e22626a9badf348f189d8ca0acb86ac235 SHA-256: da231e4140232dd08e3aaf838d3b58a721f857b98f1702351e7c6ade6b6a5fcf
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wix?keyword=versace+on+the+floor+mp3+musicpleer'. Additionally, the PDF is flagged as a link farm, suggesting an attempt to manipulate search engine results or distribute content through numerous links. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same malicious URL.

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=versace+on+the+floor+mp3+musicpleer
    • https://cdn.shopify.com/s/files/1/0433/1775/6062/files/attestation_de_travail_en_anglais.pdf
    • https://cdn.shopify.com/s/files/1/0431/4988/5606/files/vocabulary_list_template.pdf
    • https://cdn.shopify.com/s/files/1/0438/0177/2192/files/matlab_create_cdf_from.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/63893893986.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1002/files/rodibanara.pdf
    • https://cdn.shopify.com/s/files/1/0428/6690/1148/files/18842431786.pdf
    • https://static.usrfiles.com/ugd/b8c837_31ae5b9fda44486e9c06b3ae4c9525ad.pdf
    • https://static.usrfiles.com/ugd/0a052f_83e4db8429d04d16bc961bb44ebcc424.pdf
    • https://static.usrfiles.com/ugd/b8c837_b3298a38d1344a948ab5f66ce293a1b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce4c4a72dd684b3d8cac05042bed8cac.pdf
    • https://static.usrfiles.com/ugd/b8c837_25905f369a5344ee9f6c6aa81377c426.pdf
    • https://static.usrfiles.com/ugd/96768c_6813b15ac91c4b8f98f84d7ea62e9785.pdf
    • https://static.usrfiles.com/ugd/b8c837_685c5de96c4c4fb7b9e312da8da0a627.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_off0000bd25.bin
b3f13fbf5eb26f71b1ca5437588c261e5a23d645a3d8a2598567aefa3bf68c00
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD25 5384 bytes
font_01_sfnt_off0000cf4b.bin
26c75a661bb4c5841eb7df74ea2a6f41e8a13dbfc1894cea97d6054b72302b93
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4B 10420 bytes
font_02_sfnt_off0000f33e.bin
184efd0e138a9418359f6897f9ac56b5cd93cafbd57abf30711ac2aee7e18832
pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 16120 bytes