Malicious PDF — malware analysis report

Static analysis result for SHA-256 341f9ad70f552a16…

MALICIOUS

PDF

45.2 KB Created: 2020-08-29 13:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b68e25a85c50cffbbe0139df438f0c1 SHA-1: 1fcf9a9bf2fadce178154c8e8145ec4e6b053bf1 SHA-256: 341f9ad70f552a16a9e4d8fa60f22c52c00a7f7fb75b9c71109ab0cb61b5e764
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links, many of which point to a redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically calls out the URL https://ttraff.ru/wix?keyword=kanabo+vs+tetsubo as malicious infrastructure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external PDF links, suggesting a link farm or spamming operation. The document body itself is heavily obfuscated and contains the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=kanabo+vs+tetsubo
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_dad603711759498baecad27aba6bcb64.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8d142caec924fbfbba29e46c9b633bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6a65f12f7114bc6922d0230c2b5a872.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f600633f2ff4fc5b198964fd0905691.pdf
    • https://static.usrfiles.com/ugd/b8c837_60243c40796a47ada54802728d76e76d.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/62790642219.pdf
    • https://cdn.shopify.com/s/files/1/0434/6806/2872/files/zobovutifulotatexopaxizaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/8774/1607/files/aprender_a_aprender.pdf
    • https://cdn.shopify.com/s/files/1/0437/2620/9175/files/gta_sa_copland_2006.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6968/files/66627594142.pdf
    • https://cdn.shopify.com/s/files/1/0431/2078/7613/files/exodus_pusha_t_mp3_download.pdf
    • https://cdn.shopify.com/s/files/1/0452/4739/8050/files/baguio_city_map_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_da61417200a94ceba3db15df1b75b394.pdf
    • https://static.usrfiles.com/ugd/b8c837_452c580db3c94948a7d5c352ed06c314.pdf
    • https://static.usrfiles.com/ugd/b8c837_d89f4c1daefa4a51ba6be8fbc032956c.pdf
    • https://static.usrfiles.com/ugd/b8c837_8858d9293e914f639ef3c5e852b4a3c4.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006724.bin
5178a250d9d11344cd108022d135c23e827cdc4ab84ed7a5d09514720e381c22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6724 3868 bytes
font_01_sfnt_off000074c7.bin
4f5fdb78781527ccfb7acc43595b4e62d1be1557c97971217b99ae2506b61351		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C7 4720 bytes
font_02_sfnt_off000084f0.bin
aba7ed17f56b5270ca04734475797c435196c48860cd083ab91c7ad0e0f1baeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84F0 10240 bytes

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