Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ac24f7f9cca252…

MALICIOUS

PDF

55.8 KB Created: 2020-08-14 08:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5c70de378da659b7b4c7a3fc599b332 SHA-1: 7637202ff570efdcabc3ddf7238fcbc2b3ca47c4 SHA-256: f6ac24f7f9cca2524e2732668d16ba70feab407bacc340d09422d55e11dab2f0
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.cc). The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=termination+letter+template+uk', suggesting a lure related to employment termination. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links, including a known malicious redirector, supports this assessment. No scripts were extracted, but the PDF structure itself is used for the malicious redirection.

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/pify?keyword=termination+letter+template+uk
    • http://wavobumow.lori.com.au/uploads/1/3/1/3/131384709/9966436.pdf
    • http://vexedoreb.sirwaffle.com/uploads/1/3/0/7/130775126/5003919.pdf
    • http://bazutul.clarawellsart.com/uploads/1/3/1/6/131636725/811332.pdf
    • http://files.thehill.services/uploads/1/3/0/7/130739892/lovirara_narikefowa_vuxakazoler.pdf
    • http://ninokef.sunshinejeremiahwolfe.com/uploads/1/3/0/8/130873965/venorar.pdf
    • https://cdn.shopify.com/s/files/1/0434/2431/7607/files/22063500450.pdf
    • https://cdn.shopify.com/s/files/1/0432/0939/2285/files/83658532795.pdf
    • https://cdn.shopify.com/s/files/1/0428/2118/9788/files/nutigevupufamezufowukuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/xalil.pdf
    • https://cdn.shopify.com/s/files/1/0439/4660/6760/files/the_black_temple_entrance.pdf
    • https://cdn.shopify.com/s/files/1/0429/6900/6236/files/sefagusaja.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/jixapebuxegot.pdf
    • https://cdn.shopify.com/s/files/1/0432/0890/0772/files/xojebumexesenuvawutimav.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3945/files/94186065639.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78539107281.pdf
    • https://cdn.shopify.com/s/files/1/0438/2618/4352/files/marriage_certificate_form_gujarati_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8770/files/junejetakabapigagalekipo.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_off00009d48.bin
fb8132f892271d83bb83c2ad54e6124a86b39971619bce34467ba323dfac8a31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D48 4800 bytes
font_01_sfnt_off0000ad7e.bin
044411b11b6d2014805242bafb46488fec904f0714219062029cca11c5ffae9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7E 10696 bytes

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