Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cfc22d43a58379d…

MALICIOUS

PDF

41.0 KB Created: 2020-08-18 23:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98b0d1c9608f5154032357f33252ef28 SHA-1: e8ca489c32276c11bef9bf03216c6915d8f9f1be SHA-256: 1cfc22d43a58379df73f22a540699f394d6b8675b2df3040f8520d68f925c9cd
150 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to a critical heuristic indicating it contains links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external links, many of which point to Shopify-hosted PDFs. The primary malicious URL identified is https://ttraff.ru/pify?keyword=%25CE%25B2%25CE%25B9%25CE%25B2%25CE%25BB%25CE%25AF%25CE%25BF+%25CE%25B3%25CE%25BB%25CF%258E%25CF%2583%25CF%2583%25CE%25B1%25CF%2582+%25CE%25B2+%25CE%25B4%25CE%25B7%25CE%25BC%25CE%25BF%25CF%2584%25CE%25B9%25CE%25BA%25CE%25BF%25CF%258D+%25CE%25B3+%25CF%2584%25CE%25B5%25CF%258D%25CF%2587%25CE%25BF%25CF%2582+pdf, suggesting a redirection chain designed to lead users to harmful 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.ru/pify?keyword=%25CE%25B2%25CE%25B9%25CE%25B2%25CE%25BB%25CE%25AF%25CE%25BF+%25CE%25B3%25CE%25BB%25CF%258E%25CF%2583%25CF%2583%25CE%25B1%25CF%2582+%25CE%25B2+%25CE%25B4%25CE%25B7%25CE%25BC%25CE%25BF%25CF%2584%25CE%25B9%25CE%25BA%25CE%25BF%25CF%258D+%25CE%25B3+%25CF%2584%25CE%25B5%25CF%258D%25CF%2587%25CE%25BF%25CF%2582+pdf
    • http://wemop.norwoodcavies.com/uploads/1/3/0/7/130739674/ffb7e244870a7.pdf
    • http://files.arvadatherapysolutions.com/uploads/1/3/2/6/132695438/kavoliwajeso_magivimuxig_kerifowaliru.pdf
    • http://files.dazmedia.net/uploads/1/3/2/7/132710563/1804682.pdf
    • https://cdn.shopify.com/s/files/1/0434/3067/4597/files/zupusiro.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/93345670841.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/mepuzusizirikuvuguwigawig.pdf
    • https://cdn.shopify.com/s/files/1/0431/1577/4108/files/act_not_parsing.pdf
    • https://cdn.shopify.com/s/files/1/0437/6828/3287/files/60277830691.pdf
    • https://cdn.shopify.com/s/files/1/0434/3444/2919/files/86215778787.pdf
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/lead_acid_battery_charging_methods.pdf
    • https://cdn.shopify.com/s/files/1/0429/5829/1093/files/88257599780.pdf
    • https://cdn.shopify.com/s/files/1/0434/6858/7174/files/call_location_tracker_software_free_apk.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_off00004e5e.bin
6ff339500486251830d2c762120ce85503c7392cfcf168fd0731489f085c5bca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E5E 6756 bytes
font_01_sfnt_off00006554.bin
8c8b1fd6ba185028fcbfbcb1be8c1c35cdc040fbfca8fd4691f6b137648de5c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6554 15364 bytes

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