Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11f8e01f8378167…

MALICIOUS

PDF

40.5 KB Created: 2020-08-15 02:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c36ea59edd9622911c7e1ab27cfe593b SHA-1: 031cfe0259ad045be5a4e90a6ef6e02c6a880b70 SHA-256: c11f8e01f8378167f885bb37f4bc71f4937c97301dd3349d23a8a22ec81b8026
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, some of which lead to unknown domains. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to click on the malicious link, likely leading to a phishing or malware distribution site.

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.com/pify?keyword=binomische+formel+r%25C3%25BCckw%25C3%25A4rts
    • http://fimojogav.kdefensemartialarts.com/uploads/1/3/0/8/130814397/momutiminerexu.pdf
    • http://kaguxu.primetineoutdoors.com/uploads/1/3/2/6/132683014/bac752fabdbe7f6.pdf
    • http://files.popculturehoard.com/uploads/1/3/0/7/130776619/letamewef.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/66922869277.pdf
    • https://cdn.shopify.com/s/files/1/0428/8223/6572/files/55766990152.pdf
    • https://cdn.shopify.com/s/files/1/0435/0525/4566/files/railway_reservation_form_tatkal.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/20063894887.pdf
    • https://cdn.shopify.com/s/files/1/0431/3533/6616/files/kedarijokexerozowuwib.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/72073868947.pdf
    • https://cdn.shopify.com/s/files/1/0433/4367/5560/files/artikel_budaya_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0436/9124/5733/files/c_read_text_file_line_by_line.pdf
    • https://cdn.shopify.com/s/files/1/0438/5135/0166/files/67506141553.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/27239538364.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_off00005d01.bin
8b822cf2cdc57444df68765c43e71826fb057f38e032192027cb96f92fc3acad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D01 5472 bytes
font_01_sfnt_off00006f3b.bin
753849eeb81b4327b828d9eda0a582b6a4c703c49db6bb9230b37641fd664cec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3B 11064 bytes

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