Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0587f56a68347fc…

MALICIOUS

PDF

33.3 KB Created: 2020-08-31 02:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c8f33e88bfe43bd11d9e9825ca1c42c SHA-1: 0b7b7ba21a047f288712e367d52225e56f1a3a58 SHA-256: a0587f56a68347fc3337c11483087f31587eeb293d8ef8feb27b1ea722f81739
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=basic+biomechanics+7th+edition+free'. This URL is presented within the document body, disguised as a link to a free textbook. The PDF also contains a mass external link farm, with many links pointing to static.usrfiles.com, suggesting a SEO poisoning or link farm tactic to distribute malicious content. No scripts were extracted from this sample.

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=basic+biomechanics+7th+edition+free
    • https://static.usrfiles.com/ugd/b8c837_f7d06ffd7ee54146a207f73ea5f90603.pdf
    • https://static.usrfiles.com/ugd/fa6f14_5254491584bb42c4a893c67d55fc899c.pdf
    • https://static.usrfiles.com/ugd/41a0b6_1fc38387ea624297b9e5a274ac0de5e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0c235dfc35946d0a1b74cd1f9022525.pdf
    • https://static.usrfiles.com/ugd/8acad3_6baa782013514768b649627281551298.pdf
    • https://cdn.shopify.com/s/files/1/0432/8374/2884/files/json_format_notepad_64_bit.pdf
    • https://cdn.shopify.com/s/files/1/0429/0635/3823/files/isaac_albeniz_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/guide_to_unix_using_linux.pdf
    • https://cdn.shopify.com/s/files/1/0436/2413/6864/files/22438140212.pdf
    • https://cdn.shopify.com/s/files/1/0431/3363/2661/files/47481578514.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_b9ecc8ba5d334adea18c15df848abc8f.pdf
    • https://static.usrfiles.com/ugd/b4f0c6_bb63836ff8de495db5910611cd73e881.pdf
    • https://static.usrfiles.com/ugd/b8c837_60f941783ff54948925393a1e465d837.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_off00004559.bin
2fb1847487f65b8f475d2f3e216f03dc12a4fe0163b9c986138f5ec8b739cbec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4559 5500 bytes
font_01_sfnt_off000057dd.bin
2f355fcce99f31c9b9c6ae344622dca7417f21556c0132d329fbc51759aa885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57DD 9564 bytes

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