Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c6bbac23b997b0…

MALICIOUS

PDF

43.2 KB Created: 2020-08-19 19:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c10b557baf547441079a9b86411ff321 SHA-1: 868031294db69e8def26c50f0ca808172fddbaf8 SHA-256: 21c6bbac23b997b0a0448e5ffea9ddd41ffd332b96a8f4ea43c1aa6c90036411
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=willingness+to+pay+pdf'. This indicates the document's primary purpose is to redirect the user to malicious infrastructure. The presence of a large number of external PDF links, many pointing to benign Shopify domains but likely serving as a link farm to obscure the malicious redirector, further supports this. 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=willingness+to+pay+pdf
    • http://files.worldhistorywithmrjohnson.com/uploads/1/3/0/8/130814459/jidasikeke_zomituwemej_tazeduwev_togora.pdf
    • http://wajexuge.iantheresaswonderfullife.com/uploads/1/3/1/4/131438268/zegogavizeba.pdf
    • http://pivojora.serradesigncollective.com/uploads/1/3/0/8/130814328/neridade-dexivelad.pdf
    • http://files.cristinacaruana.com/uploads/1/3/1/0/131069886/c9642871239.pdf
    • https://cdn.shopify.com/s/files/1/0439/3893/9048/files/preguntas_del_ser_bachiller.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/93116913981.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/76934474679.pdf
    • https://cdn.shopify.com/s/files/1/0434/0904/7708/files/attributive_adjectives_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/26422597075.pdf
    • https://cdn.shopify.com/s/files/1/0433/5327/6574/files/detazim.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/josobekiguvuradore.pdf
    • https://cdn.shopify.com/s/files/1/0431/3032/3095/files/fobadefetomarokizeta.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_off00005dd3.bin
923083f2a097f2e79c88805a897d0f4c59067dd1fb522114ce970c08b437ce54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD3 5016 bytes
font_01_sfnt_off00006f09.bin
3916dca728de999f405d06d397f13544425c662dc03a5df83bb3d6574e5b441f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F09 10312 bytes
font_02_sfnt_off00009232.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9232 4324 bytes

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