Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbd470a8fb72444…

MALICIOUS

PDF

45.1 KB Created: 2020-09-01 01:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3ecf6971d418c7e5547ca00146bfd93 SHA-1: 33313d802c21c022bf38934e5757d2f8b388a84c SHA-256: 4bbd470a8fb72444bf01a8d5679e624ba280458daff83dca024dba52051c67f8
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and a large number of other URLs hosted on 'cdn.shopify.com', indicating a link farm for SEO poisoning. The ML classifier also flagged this PDF with high confidence. The primary attack pattern involves luring the user to a malicious site via a deceptive link.

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/wix?keyword=hangman+cool+math+answers+places
    • https://cdn.shopify.com/s/files/1/0436/6221/3273/files/chinese_language_video_songs.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6995/files/paul_wall_girls.pdf
    • https://cdn.shopify.com/s/files/1/0439/2402/9608/files/nakesetakodubejix.pdf
    • https://static.usrfiles.com/ugd/b8c837_edb856a9c6ec4f37b96d4757c6fd5147.pdf
    • https://static.usrfiles.com/ugd/f523c3_78db8d746741492b841b2e4ca4caea44.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_80b4945b91bb46bdab32de85af0b5b2a.pdf
    • https://static.usrfiles.com/ugd/10b11f_7acfb0750e9f446dbaa92c24e5a59db0.pdf
    • https://static.usrfiles.com/ugd/0d089b_5a3dacf754294277b81d7b5de24307d4.pdf
    • https://cdn.shopify.com/s/files/1/0431/7852/4831/files/87391889981.pdf
    • https://cdn.shopify.com/s/files/1/0432/9721/0532/files/cardiolipin_ab_igm_qn_answer.pdf
    • https://cdn.shopify.com/s/files/1/0430/6262/4405/files/arkitekturang_filipino_gerard_lico_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/85207981998.pdf
    • https://cdn.shopify.com/s/files/1/0428/5680/8615/files/medivitedizuketanaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/1399/5672/files/31454976549.pdf
    • https://cdn.shopify.com/s/files/1/0431/9199/2484/files/11591596796.pdf
    • https://cdn.shopify.com/s/files/1/0428/0342/9535/files/lobatisiga.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_off000072b4.bin
78e642e57633312edf9dc2f4748559234c6bcc34d6fce2ae3545fa0eeea3eb5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B4 5400 bytes
font_01_sfnt_off000084fa.bin
4b769183f348b2276098c64481dde626c9e5cf9e66818058c1b9a5bce9d51d81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84FA 10024 bytes

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