Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da02bd37bb1cd73…

MALICIOUS

PDF

46.0 KB Created: 2020-08-30 20:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a83173dc15104af2097f1bc2fb280925 SHA-1: 20da6fcc397280adb4557b8bbddebaa63e702197 SHA-256: 2da02bd37bb1cd73fb928a215c9250c5e61650f4a75dccd628301ba1a0d2e0db
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though partially corrupted, contains text suggesting it is a lure for a 'workshop manual'. The primary malicious IOC is the redirector URL, which is designed to lead users to further malicious content. The file also contains a large number of embedded links, many pointing to static.usrfiles.com, suggesting a link farm for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.me/wix?keyword=opel+corsa+workshop+manual+free+down
    • https://static.usrfiles.com/ugd/b8c837_cd6761519cde4555960332b4d5ed1932.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_771375b0e9214114893da29b167ee3a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_905a349e35e3427d888c29e42dddf4a6.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/68374371226.pdf
    • https://cdn.shopify.com/s/files/1/0437/4344/5141/files/atlas_copco_air_compressor_maintenance_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/0017/6544/files/manovaju.pdf
    • https://cdn.shopify.com/s/files/1/0433/4708/3418/files/reading_fluency_passages_high_school.pdf
    • https://static.usrfiles.com/ugd/b8c837_e39f5220c022485ba0e63cdb5461b43d.pdf
    • https://static.usrfiles.com/ugd/b8c837_66def0301fec4b8982a9bcd60fb46537.pdf
    • https://static.usrfiles.com/ugd/b8c837_cbe46c49a87349c492b1bab2a4e8def3.pdf
    • https://static.usrfiles.com/ugd/cf79db_795243800c874bec8d0839372551f685.pdf
    • https://static.usrfiles.com/ugd/b8c837_68a5d3c55f344a95a4998d1bb1290c7a.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_off00006c5a.bin
84a6a989ff1a0a1c9f0c66365c4c5219c108e52b940e79ce5bd80d6bf5ad79cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5A 5580 bytes
font_01_sfnt_off00007f34.bin
c69ad046c2a9b281d767dfd3d023e57329d2c2d7d5b1ac0527fd6e55d38c518c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F34 13472 bytes

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