Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c6b53ada310dfd…

MALICIOUS

PDF

44.8 KB Created: 2020-08-30 02:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78284965dae25249d156bf42e481f605 SHA-1: 2b1a8c32b5fb599b0222bdf1397f6ea392df8450 SHA-256: 83c6b53ada310dfdb43cf4323e1201f07773824ef1d24a1849cdab599cbd2902
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 ttraff.ru. This URL is embedded within the document body, disguised as a CLEP study guide. The document also contains a PDF link farm heuristic, indicating a large number of external links, many of which are hosted on Shopify. The primary malicious URL is the most critical IOC.

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.ru/wix?keyword=clep+official+study+guide+pdf
    • https://cdn.shopify.com/s/files/1/0433/8624/1187/files/85922261344.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8532/files/timusekubezofamelibeladaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/9898/6909/files/mipovewelavabojuzefop.pdf
    • https://cdn.shopify.com/s/files/1/0438/1910/6461/files/palabras_con_illo_illa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5203/9324/files/coffee_shop_business_plan_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0433/7768/8743/files/sunej.pdf
    • https://cdn.shopify.com/s/files/1/0435/2314/5896/files/descriptive_and_inferential_statistics_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/60266182231.pdf
    • https://cdn.shopify.com/s/files/1/0431/7895/0810/files/tinulobivimefuvagepimotiw.pdf
    • https://static.usrfiles.com/ugd/54fa57_5f342e1cc9e14dec82780001e3bc57e5.pdf
    • https://static.usrfiles.com/ugd/97634b_f22c62d9b3a047f1b63f799a945a74b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6cc0c3695a347a68395060aaec38f3e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6513caed15544eba0daf023de20d427.pdf
    • https://cdn.shopify.com/s/files/1/0434/2690/6264/files/70751874838.pdf
    • https://cdn.shopify.com/s/files/1/0439/3231/9912/files/cd_writer_software.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006228.bin
2f432c48e31a0141f7429830251592caaa8f462683ba8bd6b520ca2a04aa855b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6228 5128 bytes
font_01_sfnt_off000073b5.bin
20936fc74099c38a1f42806da243a1ad75bd3e09805fbbba8ffa773b6a4c2830		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B5 10736 bytes
font_02_sfnt_off0000985b.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x985B 4324 bytes

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