Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1d2f455bb8a551…

MALICIOUS

PDF

41.8 KB Created: 2020-08-31 04:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac04ebc94e415542031332712c34ec9e SHA-1: bffe10cf8b2556c3ec59fae970e1716043497816 SHA-256: 6f1d2f455bb8a5510da6d0ea8aa334321cfd67a9716294f542b314e5a0b72efb
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, `https://ttraff.cc/wix?keyword=choice+of+games+apk`, which is likely intended to deliver a second-stage payload. The document also exhibits characteristics of a link farm, with numerous embedded links to PDF files hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute 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=choice+of+games+apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4665/8463/files/26424514734.pdf
    • https://cdn.shopify.com/s/files/1/0430/0577/1939/files/86528454573.pdf
    • https://cdn.shopify.com/s/files/1/0432/6984/9248/files/gowalutetivokomibedokosen.pdf
    • https://cdn.shopify.com/s/files/1/0430/9506/4733/files/36134915902.pdf
    • https://cdn.shopify.com/s/files/1/0435/1731/3178/files/bully_anniversary_edition_apk_lite.pdf
    • https://cdn.shopify.com/s/files/1/0439/1639/4648/files/86134477651.pdf
    • https://cdn.shopify.com/s/files/1/0433/9620/2661/files/aerial_yoga_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/8849/5270/files/introduccion_al_budismo_libro.pdf
    • https://cdn.shopify.com/s/files/1/0430/8588/9689/files/77112807972.pdf
    • https://cdn.shopify.com/s/files/1/0433/6621/9941/files/72908192085.pdf
    • https://static.usrfiles.com/ugd/10e3af_60bea6319b094a0b8485b6ec40cd288c.pdf
    • https://static.usrfiles.com/ugd/f459ea_9cd820a1196945ef9a92a7946aa1e630.pdf
    • https://static.usrfiles.com/ugd/cf79db_ccea0cd7a01745f39f4bfee7bda2de2d.pdf
    • https://static.usrfiles.com/ugd/f3cb45_2ede29f71dfb4e7ca1565548e56deb1d.pdf
    • https://static.usrfiles.com/ugd/3fc21f_70ee9639deba4d12b1a000bad6fd4225.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_off0000500e.bin
affd03515ea8d49d3237f03e13baaf86311a55fc8ec9112de0bfb9e7b92463a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x500E 5272 bytes
font_01_sfnt_off000061e7.bin
c3bf5b67dd5f8a642357d504f9ba0caf5d222470a56e0b84f97f0b53a312eb96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E7 10316 bytes
font_02_sfnt_off0000857b.bin
764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x857B 16144 bytes

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