Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f370fc4ea7ea3e…

MALICIOUS

PDF

44.1 KB Created: 2020-08-18 21:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f5dbf732fbb0247461a991f0f6f813a SHA-1: 4a1f9ccab1ff0ae9e5d6b8e48762f7e21fabe183 SHA-256: c0f370fc4ea7ea3e17df34f15c25f4b5bbb1cf7b937184605667356ddd19f044
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=website+to+pdf+mac'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the malicious URL and other URLs hosted on Shopify, suggesting a link farm or redirection scheme designed to lure users to malicious content. No scripts were extracted, but the primary attack vector appears to be 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.ru/pify?keyword=website+to+pdf+mac
    • http://files.liveactivepc.com/uploads/1/3/0/7/130739274/4230709.pdf
    • http://fitar.ncc-tu.org/uploads/1/3/0/7/130776021/1241865.pdf
    • https://cdn.shopify.com/s/files/1/0429/5678/3772/files/13885089504.pdf
    • https://cdn.shopify.com/s/files/1/0434/6413/0725/files/the_stereotype_song.pdf
    • https://cdn.shopify.com/s/files/1/0437/5147/3313/files/convert_arabic_to_english_word.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/71284094610.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bodadajigewodozisidezufe.pdf
    • https://cdn.shopify.com/s/files/1/0441/4016/7320/files/revubomeniralowevapoluwik.pdf
    • https://cdn.shopify.com/s/files/1/0431/7885/2507/files/67950954864.pdf
    • https://cdn.shopify.com/s/files/1/0433/7899/9446/files/60047038883.pdf
    • https://cdn.shopify.com/s/files/1/0432/1977/9742/files/gpf_account_slip_2018-_19_tamilnadu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/56096991692.pdf
    • https://cdn.shopify.com/s/files/1/0431/2370/3970/files/sisujameni.pdf
    • https://cdn.shopify.com/s/files/1/0431/9766/1348/files/d_d_guiding_bolt.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062a1.bin
48f49a03b972e6c53812877c8c539f86fd81de4292f8facf5080d7f21f49541c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62A1 5008 bytes
font_01_sfnt_off000073b0.bin
84edfd44f8a4c0356d045afe93b13b63775bcda9a1c8ab2273d7c472730781f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B0 10012 bytes
font_02_sfnt_off000095f1.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95F1 4324 bytes

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