Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4e4754f0fbe1e2…

MALICIOUS

PDF

33.3 KB Created: 2020-08-30 02:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f8b3e59af783882484dbf2cdf9e7133 SHA-1: 87a9789d0b2d465b1e7feace76811eaa583931ce SHA-256: fa4e4754f0fbe1e25c7d3c5505d20d1c6ddc8d6a27a96d08c8d8428be1d3054b
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, specifically pointing to 'https://ttraff.ru/wix?keyword=acsm+clinical+exercise+physiologist+study+guide'. This URL is embedded within the document body, disguised as a study guide. The presence of numerous other benign-looking PDF links suggests a link farm or SEO poisoning tactic to mask the malicious intent. 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.ru/wix?keyword=acsm+clinical+exercise+physiologist+study+guide
    • https://static.usrfiles.com/ugd/1b8612_4bf2b20b4d174396bf356fe4be796c76.pdf
    • https://static.usrfiles.com/ugd/d94ae5_0cc89a7329ea42d182e45d2628ea7eb8.pdf
    • https://static.usrfiles.com/ugd/23b571_b8ad0cba451e47028f7a53642387b06c.pdf
    • https://static.usrfiles.com/ugd/429b25_14a590844266467b8960aaff92e2bb07.pdf
    • https://cdn.shopify.com/s/files/1/0436/4913/8846/files/bahama_breeze_lunch_menu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3093/6733/files/18644406304.pdf
    • https://cdn.shopify.com/s/files/1/0466/7808/1701/files/32969347889.pdf
    • https://cdn.shopify.com/s/files/1/0443/5791/0684/files/online_marathi_book_reading.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99914628395.pdf
    • https://static.usrfiles.com/ugd/a18aa6_81e0a96a186b4fd4b3a45b7db495366e.pdf
    • https://static.usrfiles.com/ugd/b8c837_6263b29036f743c0a76294c39c240abd.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5bd33ce2b044034aaaf29287af45e58.pdf
    • https://static.usrfiles.com/ugd/b47706_50d58238734044fbab884ae0d9bd4dad.pdf
    • https://cdn.shopify.com/s/files/1/0432/9875/0629/files/5949786874.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vitalifurefafimeribedewo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5590/6967/files/96779804427.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_off00004479.bin
6fe34e69bebc6559413b525b0c47cf6d1b59c61c429999797a8f5c666c109aab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4479 5648 bytes
font_01_sfnt_off0000577e.bin
22be4c484cb1dcfe842d0c9c0a2dba8851f75cbeb5da7442bd934981a0906bb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x577E 9948 bytes

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