Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d77f9da567f7a92…

MALICIOUS

PDF

36.9 KB Created: 2020-08-04 10:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b621ffb6121a8a6f1c0415278f88e5af SHA-1: eefcfdf6cc9e21f89532e580910a307f77f477ea SHA-256: 3d77f9da567f7a928536bfc1446c4bc58e38b2342664e13d1f175698f34e7f92
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, pointing to 'https://ttraff.ru/pify?keyword=penguin+reader+level+4+pdf+free+download'. This URL is embedded within the document body, suggesting a social engineering lure to trick users into downloading or accessing malicious content. The presence of a large number of external PDF links further indicates a link farm SEO tactic, common in malware distribution. 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.ru/pify?keyword=penguin+reader+level+4+pdf+free+download
    • http://files.mustangswest.com/uploads/1/3/1/4/131437680/355197.pdf
    • http://files.opendoorbozeman.org/uploads/1/3/0/7/130776096/e47b7213b1.pdf
    • http://files.agroecologyhub.info/uploads/1/3/2/7/132740594/6552854.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/zozujapoxuxikele.pdf
    • https://cdn.shopify.com/s/files/1/0431/0997/4169/files/emoji_movie_script.pdf
    • https://cdn.shopify.com/s/files/1/0432/6899/7283/files/fedubat.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8285/files/96334271147.pdf
    • https://cdn.shopify.com/s/files/1/0429/5376/9123/files/centralization_of_authority.pdf
    • https://cdn.shopify.com/s/files/1/0433/4731/2789/files/gonudal.pdf
    • https://cdn.shopify.com/s/files/1/0429/5258/9465/files/16326050781.pdf
    • https://cdn.shopify.com/s/files/1/0428/7895/9775/files/bufuzowur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0697/5382/files/88836767794.pdf
    • https://cdn.shopify.com/s/files/1/0433/6553/1806/files/nutedonuzajonexamuri.pdf
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/18566094467.pdf
    • https://cdn.shopify.com/s/files/1/0431/0768/0405/files/janoxiguriximoxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8405/3669/files/dogekakofedudadidise.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_off000051da.bin
99c897d74326de1cfe4b9b4c7c886ed85c3b6b8758443bb915f596770ff1873a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51DA 5272 bytes
font_01_sfnt_off000063f6.bin
9cfc0435625481071c4bf7ced28872b6c2d92ef8b8f14905bbde1dead5824f82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63F6 10204 bytes

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