Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85ab43734050777…

MALICIOUS

PDF

63.9 KB Created: 2020-07-27 08:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9461a2fc014023a529b4c620074d579 SHA-1: 664aa4baccc694742cfe8e342c7104626c0a11f4 SHA-256: f85ab43734050777cdb93ad6eac923f3bef34aca5aff0e442baea55fb33ca9ac
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one specifically to a known malicious redirector at ttraff.ru. This indicates a social engineering attempt to drive traffic to potentially malicious sites, likely for phishing or malware distribution. The ML classifier strongly supports the malicious nature of the PDF.

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=apache+openoffice+free++windows+10
    • http://files.fpzasurfcoast.org/uploads/1/3/1/1/131163540/609177.pdf
    • http://files.fullspectrummassagetherapy.com/uploads/1/3/2/6/132695387/gatagurijulupef_kefutepod_kepal.pdf
    • http://files.hotelsinischia.com/uploads/1/3/1/1/131164552/0ab2bb90e88.pdf
    • https://cdn.shopify.com/s/files/1/0431/8006/4936/files/72079526302.pdf
    • https://cdn.shopify.com/s/files/1/0431/6931/7020/files/3891182583.pdf
    • https://cdn.shopify.com/s/files/1/0428/5467/8687/files/30049902455.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/sotapafogexonab.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7967/files/57334645176.pdf
    • https://cdn.shopify.com/s/files/1/0435/5850/2563/files/xixowupagixiraremeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/51064689801.pdf
    • https://cdn.shopify.com/s/files/1/0436/6319/6310/files/zudoferawiledexufo.pdf
    • https://cdn.shopify.com/s/files/1/0440/7050/2565/files/50631284924.pdf
    • https://cdn.shopify.com/s/files/1/0431/7688/6431/files/nopilobilepajibetaxozi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5992/9503/files/84325929617.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
stream_007_off0000da8e.bin
4515125252cba39ce99642e4155234cc4e7e6446c0b93081e29a253eee8b1fb0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDA8E 16928 bytes
font_00_sfnt_off0000a431.bin
dad27d2d2af1204e1905bc23d686f8eb1ad45c7ecdfe7006664a7536eead7f70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA431 5196 bytes
font_01_sfnt_off0000b5d3.bin
65976335c9eba40c1dfa628638a7acadf8b47c9537e3cd40ff4b33a9245a4b2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D3 10712 bytes

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