Malicious PDF — malware analysis report

Static analysis result for SHA-256 12afa0aeccd30ac4…

MALICIOUS

PDF

40.4 KB Created: 2020-09-10 05:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c71520805fdfd4c72c7fb803ef60d5b SHA-1: a18fc58eed9d1933d1d43e15e2fd028a5b7a5c12 SHA-256: 12afa0aeccd30ac416d51dbe4dcc064a51691fa8de6994c46314410b5099b9e4
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.club'. This URL is presented within the document body, disguised as a free font download. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to Shopify and other file-hosting services, likely to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.club/wix?keyword=axiforma+semibold+free+font
    • http://files.ncfllandftc.com/uploads/1/3/0/7/130739924/41354.pdf
    • http://files.shelleyburgoyne.co.uk/uploads/1/3/1/6/131607712/f58f40059eadeab.pdf
    • http://files.daisydogfood.com/uploads/1/3/2/7/132740413/fc06573258d6173.pdf
    • http://files.mastertimothy.com/uploads/1/3/1/4/131437615/befoposalabot_zabigak_ragoviwovomoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/7520/5288/files/vevakabizunudogotofigu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sosivizugepu.pdf
    • https://cdn.shopify.com/s/files/1/0466/3951/3765/files/82477531811.pdf
    • https://static.usrfiles.com/ugd/e3834b_3918416885ce447f83c77b63e1bd93c1.pdf
    • https://static.usrfiles.com/ugd/a8ca0f_c79404788c3b4a64bc24b6c940d7e47b.pdf
    • https://static.usrfiles.com/ugd/82e28d_9f4e5184fd914dfd9919d5b803228092.pdf
    • https://static.usrfiles.com/ugd/db1da1_6b55092fbe8a489391052895f5442874.pdf
    • https://static.usrfiles.com/ugd/f59309_b1b97700d0904c2586115415291f1118.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ac4.bin
573e319cd999d67e921115d49052ef128d956df5f8ecc5d3a78960366878e22d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AC4 5248 bytes
font_01_sfnt_off00005c86.bin
98aaeda74791a1623ac423a6ee1d61061d8cbafcc1e1875460b4b0c96ea5c8a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C86 10300 bytes
font_02_sfnt_off00007fff.bin
ce90dcb8f80a691a226d66d7b9fb40db13b52946125f6d312f8860abae454107		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFF 16084 bytes

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