Malicious PDF — malware analysis report

Static analysis result for SHA-256 25dc37a26f09f906…

MALICIOUS

PDF

40.1 KB Created: 2020-08-31 04:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bad55678726c55668e16f7788f2e5d9 SHA-1: cb6408ef434c3609a86b3a4d11ec70b76e6abec8 SHA-256: 25dc37a26f09f90626dd5f3caf3af40d966f9d3e435f68607d0f87d51264d913
120 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.cc', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Office 365 for dummies pdf free down', suggesting a lure to download further content. The presence of a large number of external PDF links, many hosted on 'static.usrfiles.com', indicates a link farm designed to attract search engine traffic, further supporting the lure-based attack pattern.

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=office+365+for+dummies+pdf+free+down
    • https://static.usrfiles.com/ugd/b8c837_ad3664f75d21438c9aca8596a88ec93b.pdf
    • https://static.usrfiles.com/ugd/b8c837_626a42b00ac241278c55a1596d4feacd.pdf
    • https://static.usrfiles.com/ugd/eed56f_ed34e495b2004cc0b181b861c79824b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_623c16f8a7a44d1eaae6d3bf95a21b91.pdf
    • https://static.usrfiles.com/ugd/8e1900_791e67ddb04e47ff8990d91167265044.pdf
    • https://static.usrfiles.com/ugd/e2c250_e6e8b34a477d401190236d477488aa57.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4b7d39b72a64b3a9ebd791606d268f6.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_565ec379aede46adb1e35515df1eebe1.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/79437824277.pdf
    • https://cdn.shopify.com/s/files/1/0431/9536/7584/files/kirokimegubidifoxot.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0553/files/formal_dining_room_sets_walmart.pdf
    • https://cdn.shopify.com/s/files/1/0431/1059/6765/files/tatiku.pdf
    • https://cdn.shopify.com/s/files/1/0431/4588/7905/files/hungry_shark_evolution_mod_apk_2018_halloween.pdf
    • https://cdn.shopify.com/s/files/1/0437/9348/1885/files/87809137854.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_off00005d88.bin
7ee75b032f1073aaeca76e3b7d096a240d8d7d4705d99b405e273c6ec4ad7914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D88 5620 bytes
font_01_sfnt_off0000709e.bin
8bb929c0749191cea6c745b3c46faf6104ceb6feca127183a36e4220047c4ce3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709E 10352 bytes

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