Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fda592163c563a7…

MALICIOUS

PDF

38.0 KB Created: 2020-08-31 23:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abbc563bccfa874e805161213550daa2 SHA-1: f8b3fb5df89a2bc1667587ba9bb26e5904770a4e SHA-256: 3fda592163c563a73fda13beeb35ce9e3c8cf3232c323eb0c06b3f1469c58f3c
150 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a high number of embedded links. One critical heuristic firing indicates a malicious redirector link to 'ttraff.cc', which is known malicious infrastructure. Another heuristic identified a PDF link farm hosted on Shopify, with numerous links pointing to various PDF files. The document body contains garbled text along with the malicious URL, suggesting an attempt to disguise the malicious content.

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.cc/wix?keyword=bollywood+video+song+2017+free
    • https://cdn.shopify.com/s/files/1/0431/4854/2109/files/biwuduvijigirimisiluwa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8869/0841/files/45713921978.pdf
    • https://cdn.shopify.com/s/files/1/0435/6256/5781/files/chichester_university_music_performance.pdf
    • https://cdn.shopify.com/s/files/1/0429/8365/3527/files/alprazolam_bula_anvisa.pdf
    • https://cdn.shopify.com/s/files/1/0438/9748/7512/files/jutom.pdf
    • https://cdn.shopify.com/s/files/1/0430/2766/0951/files/perimeter_and_area_of_triangles_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/7161/8723/files/advanced_engineering_mathematics_greenberg_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/8615/1834/files/melani.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/authorize_net_test_credit_card_number.pdf
    • https://cdn.shopify.com/s/files/1/0432/1063/7475/files/standard_papierformate_usa.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/58443590371.pdf
    • https://static.usrfiles.com/ugd/0ad6c7_9b6aaafaa817493ba64f60a2d6f4c587.pdf
    • https://static.usrfiles.com/ugd/c1108c_30a7d3a715a94497b393d25470bf2cff.pdf
    • https://static.usrfiles.com/ugd/b85eb0_d1d2cc966a88406b8eaf836209ff9d73.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_off000053ab.bin
0e9f4a362184d768e10150c5e49a08ed4b337777da5e5eb923daead6360c464a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53AB 5572 bytes
font_01_sfnt_off000066f7.bin
98c9142e21818a3612258e05badd2be0981eb749cdd2e010e2049b1aabb8d94a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F7 10748 bytes

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