Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8c64944763afed…

MALICIOUS

PDF

42.2 KB Created: 2020-08-29 20:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c03c34fcc9412876c80edcfa348b4359 SHA-1: 256b0af3ad2a5329e5eb4e47d0dd88e4cc64c94d SHA-256: bd8c64944763afed9aea28ab35ba1f28f1051d2a3c066c63d0911af909cc46cd
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URL points to a known malicious redirector, and the document body, though heavily obfuscated, contains this URL and numerous other links to external PDFs. This suggests an attempt to lure users to malicious sites or engage in SEO abuse.

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.com/wix?keyword=arbol+de+cirian
    • https://static.usrfiles.com/ugd/b8c837_04441d11a284475b909021614dadf60f.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e726f13ab8c42808e45e892aa7dce36.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1117a24b7914803b9f29e7f4ed783d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_15b2830db5804f10a4d84a83cd59a3a4.pdf
    • https://static.usrfiles.com/ugd/22739b_5b5aeaf9f34646d08c1781a928c2bbef.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a10ce090e854ed3947ec2c181d10032.pdf
    • https://cdn.shopify.com/s/files/1/0440/8036/5733/files/i_c_u_ki_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/gonuvirewemixomuvovinugev.pdf
    • https://cdn.shopify.com/s/files/1/0432/0935/9517/files/way_back_into_love_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/5434/2044/files/tekken_3_video_game_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/zakezojebuwafitolovirul.pdf
    • https://cdn.shopify.com/s/files/1/0437/3754/6917/files/jowiwanilolenukeketon.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0119/files/el_pollo_loco_menu_nutrition.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006401.bin
a5f311f31d88a5a3e8c0365ac93069d650f92a8931b3d97669dfc56229c54fbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6401 4884 bytes
font_01_sfnt_off0000749e.bin
8e7b3d0d73192eed9c435af8c4b96fd0380d30b2b192c6d9cf7c3b5516311394		 pdf-font-stream PDF embedded font (sfnt) at offset 0x749E 11780 bytes

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