Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7261e4902dbdd3…

MALICIOUS

PDF

43.5 KB Created: 2020-08-31 07:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61c8661d49bf5d7563de5611b6bdc5f2 SHA-1: 11b63a18d23103d91cd61923873e0708ad6e1f77 SHA-256: cb7261e4902dbdd3c64f2f374827f9725d370833eea33fa8b9123d6344835dde
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, which points to a URL that appears to be a lure for downloading software. The document body, though heavily obfuscated, contains the same URL and references 'offline chess free download for wind', reinforcing the lure. The presence of numerous external PDF links, many pointing to static.usrfiles.com, suggests a link farm designed to improve search engine ranking for such lures.

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/wix?keyword=offline+chess+free+download+for+wind
    • https://static.usrfiles.com/ugd/3ab5ed_7072bc89c9024648bd3701491443fa58.pdf
    • https://static.usrfiles.com/ugd/3de8a6_dd73fbb146d34b0e901ae0b0ef1e437e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d9d6dc979fe4e8493946f2e5b0cc57e.pdf
    • https://cdn.shopify.com/s/files/1/0440/6696/3621/files/puvil.pdf
    • https://cdn.shopify.com/s/files/1/0439/2599/5688/files/sepijajovade.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9b934b093f84594a9050bd36f476a63.pdf
    • https://static.usrfiles.com/ugd/99afdc_7f3b0c658ae143dbadf0e3dea1ed20ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6fd4b02b5e943abaa562e51fc43eed0.pdf
    • https://static.usrfiles.com/ugd/cf14a4_1abac909759c4894badd9d59790fdebd.pdf
    • https://cdn.shopify.com/s/files/1/0431/8160/5018/files/bematech_mp_4200_th_driver_usb.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/14588047904.pdf
    • https://cdn.shopify.com/s/files/1/0435/4496/9367/files/apeman_c450_please_format_card.pdf
    • https://cdn.shopify.com/s/files/1/0430/9994/7169/files/fujebazubiji.pdf
    • https://cdn.shopify.com/s/files/1/0429/6808/8742/files/wheel_of_time_book_12.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_off00006ad1.bin
fd1ac08a60dc62830f03b60c58363e90ae68e5101317cc896c0f057d7100e482		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD1 5228 bytes
font_01_sfnt_off00007ca3.bin
e080d356fdc33b253439830efdb3b083e6de734d13cd32b7d04f3df607e3b191		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA3 10652 bytes

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