Malicious PDF — malware analysis report

Static analysis result for SHA-256 041842d7e336e366…

MALICIOUS

PDF

47.2 KB Created: 2020-08-31 01:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b22452f3e85c8c0530c86ed62f9cfec SHA-1: 3e7560f31444bba6410fd2cb350d0d3a3afe1803 SHA-256: 041842d7e336e36665a033908d41da8a2312dffbf06adbf06ccab2accae0e7ab
162 Risk Score

Malware Insights

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

The PDF contains a lure for a fake download of 'One direction four full album zip', which is a common social engineering tactic. It embeds a link to `https://ttraff.cc/wix?keyword=one+direction+four+full+album+zip`, identified as a malicious redirector. The PDF also contains a large number of links to external PDFs, suggesting a link farm or SEO manipulation to increase visibility of malicious content. 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.cc/wix?keyword=one+direction+four+full+album+zip
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_249d48c19f4e44d79ddff24efe81c97d.pdf
    • https://static.usrfiles.com/ugd/738632_a74824e8dbfa4820a020c6f2e6c4f29c.pdf
    • https://static.usrfiles.com/ugd/de3d83_9931042f3c534c0fb0bb745260ee45b2.pdf
    • https://static.usrfiles.com/ugd/f0f215_3d99969ab6184e98a20df480946cdebe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2110/files/30159706496.pdf
    • https://cdn.shopify.com/s/files/1/0432/1568/3744/files/61916003881.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/broadsheet_melbourne_top_restaurants.pdf
    • https://cdn.shopify.com/s/files/1/0430/6396/7906/files/13351747777.pdf
    • https://cdn.shopify.com/s/files/1/0434/6609/6806/files/89059285559.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_98bbaeac857941cc933c7f72a3cd2fce.pdf
    • https://static.usrfiles.com/ugd/b8c837_bcd678c7ef524c07bc309c103da931d5.pdf
    • https://static.usrfiles.com/ugd/1e4819_9ce1eb13a54445139b80adb6804cdd01.pdf
    • https://static.usrfiles.com/ugd/98e298_02d0fe2dd89b4c54b5654d7438366841.pdf
    • https://static.usrfiles.com/ugd/7603ae_87c4af99c5a54de4ad6eb648b023ea87.pdf
    • https://static.usrfiles.com/ugd/a4e402_d183e993fa6a48518017b2b2ac724805.pdf
    • https://static.usrfiles.com/ugd/d216cb_6af49aca3236434da39c290bb5942eda.pdf
    • https://static.usrfiles.com/ugd/b8c837_6fe114e92fed432bb41651a335f86c31.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a84.bin
4e4f55fd8da88d5044d73e01dc4eb9fc01aee1656c665bac98b3f0ec028c456a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A84 5340 bytes
font_01_sfnt_off00008c90.bin
ee7bcfc2077974cb9daa35211028edf864b2fd4501f8053447fd74e849ff3d31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C90 10344 bytes

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