Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b89fa1e4e16bb8…

MALICIOUS

PDF

35.0 KB Created: 2020-08-30 01:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 947ecf47aba5cf4112fc45c9fc09c56e SHA-1: c76113eeebd4cf00300f29a47cc1d9af21b41395 SHA-256: b8b89fa1e4e16bb8b0b2768584fab076630b294bb13c918858831f21a4cc4a9a
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, specifically pointing to 'ttraff.com' with a keyword suggesting a lure. The document body, though heavily obfuscated, contains the same URL and other benign-looking PDF links, likely part of a link farm to improve search engine ranking and visibility. The primary attack pattern involves tricking users into clicking the malicious link under the guise of finding textbook answers.

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=bon+voyage+french+1+textbook+answers
    • https://static.usrfiles.com/ugd/f96b02_ef6a3a49615140c99a2e06af49799ba5.pdf
    • https://static.usrfiles.com/ugd/b65acf_2ac8c4becdea4f208d3e4c11f7ac2114.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ac85aa85a6c4456be04a1ff789b1937.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0124/files/material_requirement_planning_journal.pdf
    • https://cdn.shopify.com/s/files/1/0434/2611/9847/files/dnd_4e_character_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/0091/2282/files/bonufagilukowijer.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/jinerudejox.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8405a7a87514521a8b6e3a1fa891439.pdf
    • https://static.usrfiles.com/ugd/b8c837_19154cf37f1f486abfee7d2ebc6f5201.pdf
    • https://static.usrfiles.com/ugd/0c41e7_6455d5e821954911a7efb97e1fc84b0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_cbac040239c144b69e7ab5f200ec356c.pdf
    • https://static.usrfiles.com/ugd/8b9728_7c834125c1434ef694512a2f07c8a417.pdf
    • https://static.usrfiles.com/ugd/d5d855_82271cc51d574ed79d334d0befd09d2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec07f4d7eb984ae492582043b5a560e4.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_off00004923.bin
c7185178eede21a2efb1156e4762ee451c917af9250acaef9d3cc0cbfbafea30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4923 5740 bytes
font_01_sfnt_off00005cd5.bin
fa625a0235f04f15af7ba3e747c7f606c345c67144183d954644e92c2dd6ec35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD5 10060 bytes

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