Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb3473e17223361…

MALICIOUS

PDF

36.7 KB Created: 2020-07-24 11:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18c6c88fc1ce67766e9a0e74493f002c SHA-1: 08e8e2c1de3ea6c95e25caaa8efef12dd206d659 SHA-256: 2fb3473e172233611ac9dbb60725e1f79b9e83b8041b1061302d985f2dcde621
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure for sheet music, which is then used to mask the malicious redirection. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious PDF.

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/pify?keyword=broken+halos+sheet+music+free
    • http://files.fortheloveofriding.com/uploads/1/3/2/6/132682868/3412443.pdf
    • http://files.creatingmen.com/uploads/1/3/2/6/132681544/xigenitexugeweb.pdf
    • http://files.sproutsmyanmar.com/uploads/1/3/2/3/132302863/giburapudiga-dojowul.pdf
    • http://files.creatingmen.com/uploads/1/3/2/6/132681544/xig
    • https://cdn.shopify.com/s/files/1/0431/9897/2066/files/sizejofexetexogovojebil.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2903/files/16850957272.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/zaxapowadizexenipum.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/ledurof.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5447/files/kufajino.pdf
    • https://cdn.shopify.com/s/files/1/0431/0161/8330/files/tofofojuzojibanasoga.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5082/files/70810168465.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1632/files/26754830437.pdf
    • https://cdn.shopify.com/s/files/1/0430/4463/4773/files/wevusegogu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5878/1590/files/kojexo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0300/2523/files/34709385096.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fadanamimurusekebunom.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_off000053f7.bin
178b332a62c80a9a4671e581712619ef4a1ebc7f39abb2bb68288e0e48e0646c
pdf-font-stream PDF embedded font (sfnt) at offset 0x53F7 5116 bytes
font_01_sfnt_off0000652a.bin
1f68c006daf2d10b9d435da90e4f20f94e3e24ec309254e3e13fb971ab06a993
pdf-font-stream PDF embedded font (sfnt) at offset 0x652A 9564 bytes