Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6dcd51669e4382d…

MALICIOUS

PDF

42.1 KB Created: 2020-08-04 09:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8c3feacef0e95d5e8f806c992655833 SHA-1: f63ef4dd5fddb94ab1eef463ccf55e71da045b0f SHA-256: f6dcd51669e4382d8f114e2d928547fcae962fb46f85130e53194c057007546c
150 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, specifically pointing to 'https://ttraff.cc/pify?keyword=gold+star+chili+application+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to increase visibility. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=gold+star+chili+application+pdf
    • http://files.annabujak.net/uploads/1/3/1/6/131636954/lukikomolobutav-dafomajejopim-remomodinavepe.pdf
    • http://wuxaj.stellasartgallery.com/uploads/1/3/1/6/131606346/9626637.pdf
    • http://files.truthfulart.com/uploads/1/3/0/8/130874411/595672.pdf
    • http://files.pennsburydrama.com/uploads/1/3/0/7/130776401/4472202.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/tamebopa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5207/files/sojukixafumanezototir.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/39466407396.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/99771447376.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/20290443242.pdf
    • https://cdn.shopify.com/s/files/1/0450/0389/9048/files/how_to_use_notsobot.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7589/files/xavubo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6479/5044/files/alien_registration_number_f1.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/87370075096.pdf
    • https://cdn.shopify.com/s/files/1/0433/5150/7094/files/ukulele_campfire_songs.pdf
    • https://cdn.shopify.com/s/files/1/0437/3810/3962/files/zebokoridagesapevaxew.pdf
    • https://cdn.shopify.com/s/files/1/0433/8361/9736/files/22976411256.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_off00006140.bin
95e54b8b727a6d59b79a1adc81933968194c18d13d3f3fe9daf80eb84e62547d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6140 5272 bytes
font_01_sfnt_off0000732c.bin
77f295378d8ff6dc6a35ae1372e98a1924bcf8a17d84580bc93c9546652db704		 pdf-font-stream PDF embedded font (sfnt) at offset 0x732C 12508 bytes

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