Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2ca3d240e80e29…

MALICIOUS

PDF

59.0 KB Created: 2020-08-21 20:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 025c0763aa2e708ec26e8c247646fd28 SHA-1: 0ee556f85a066e2f90dce94e1ab5754633fad77f SHA-256: 1b2ca3d240e80e29705af6c3bf9de4b4ad2de1a5a5c95dd501de600b4267f88c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised as a Castlevania 3 manual. This heuristic, combined with the ML classifier flagging the PDF as malicious, strongly suggests a malicious intent. The document body, though heavily obfuscated, contains the URL that is also flagged by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF also contains a large number of external links, indicating a potential link farm or SEO abuse for malicious purposes.

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.ru/pify?keyword=castlevania+3+dracula%2527+s+curse+manual
    • http://files.maggieclapis.com/uploads/1/3/0/8/130814636/755eb.pdf
    • http://files.northpointpsychology.com/uploads/1/3/1/4/131453194/4bd2ffe0e.pdf
    • http://jorosef.anti-agingbyrjxjelly.com/uploads/1/3/2/3/132303354/8686563.pdf
    • http://files.nbltwowayradio.com/uploads/1/3/0/7/130739081/pepamox-xigonevuxokal-vekudizif.pdf
    • https://cdn.shopify.com/s/files/1/0431/2704/6301/files/30463557153.pdf
    • https://cdn.shopify.com/s/files/1/0434/1822/2753/files/ancylostoma_braziliense.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1044/files/vemonapiravabunimogoboxon.pdf
    • https://cdn.shopify.com/s/files/1/0433/2083/6254/files/braniff_airlines_pucci_uniform.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/jifijezetinete.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0626/files/astm_a534_04.pdf
    • https://cdn.shopify.com/s/files/1/0457/6133/1356/files/besharam_300mb_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4885/files/upsc_anthropology_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0440/2305/4501/files/ct_ghp_trong.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_off00009998.bin
9af09b3b78453117e7a1ae7c3035050dfa79cebfe96514728ce7a19b9fca31b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9998 4724 bytes
font_01_sfnt_off0000a9e0.bin
92ea88554ce2928999ac780134a91c03a6c66f2a08f28d96d3fd370cc59ef80f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9E0 5248 bytes
font_02_sfnt_off0000bba8.bin
16263b66f5b97c45428097f89fbca4373848e4f74472c0aa719a84ef15e32e31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA8 10192 bytes

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