Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f2c3fc12dec256…

MALICIOUS

PDF

42.1 KB Created: 2020-08-27 22:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0e3f3df35ecbf4cc6f1408194b18d86 SHA-1: 198df9b989f7df5de50226527f1232584c46f484 SHA-256: b9f2c3fc12dec2560bda3c5735d5dad09362f5f4440fc7340184819f657cd85c
152 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of a redirector URL suggests the document is part of a phishing or malware distribution scheme, aiming to lure users to a harmful site. The document body, though heavily obfuscated, contains the suspicious 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.com/pify?keyword=tarjetas+juego+tabu+para+imprimir+pdf
    • http://gavubi.tminz.net/uploads/1/3/2/6/132683024/0de499961.pdf
    • https://cdn.shopify.com/s/files/1/0440/6686/5302/files/15954944301.pdf
    • https://cdn.shopify.com/s/files/1/0432/9252/4700/files/brubeck_time_out.pdf
    • https://cdn.shopify.com/s/files/1/0435/9212/2527/files/gewokijikabetu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2290/7549/files/66859895450.pdf
    • https://cdn.shopify.com/s/files/1/0428/1656/9500/files/95122425947.pdf
    • https://cdn.shopify.com/s/files/1/0431/9464/6689/files/foxuvedami.pdf
    • https://cdn.shopify.com/s/files/1/0439/4339/5483/files/gta_vice_city_cheat_codes_for_bike_and_helicopter.pdf
    • https://cdn.shopify.com/s/files/1/0431/3812/1895/files/70049476633.pdf
    • https://cdn.shopify.com/s/files/1/0432/1938/6526/files/45410566390.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_off0000649d.bin
da4f20596047746922ae52b118c23107b1df0d83e4728e96372903dbbeb7253f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x649D 5496 bytes
font_01_sfnt_off00007739.bin
acf7bd30f242e091913b45b503bf52112bf949c294f6b1ceff93aa7772735110		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7739 10852 bytes

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