Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb86c6b6a5ea930…

MALICIOUS

PDF

43.5 KB Created: 2020-08-15 07:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0712b97fe232747c890fda5128e6e002 SHA-1: c6dca4e6f884011740e484d86086177a8b3fc455 SHA-256: 9fb86c6b6a5ea930951de612ee5b388649f8a8bb58cd0647296b7ddd7327f5de
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains text referencing 'Bluestacks 3n for windows 7', suggesting a lure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=bluestacks+3n+for+windows+7, which likely leads to further malicious content. The presence of numerous other PDF links, many hosted on Shopify, indicates a potential link farm or SEO poisoning tactic to distribute the malicious 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=bluestacks+3n+for+windows+7
    • http://bunipofu.danesinaustralia.com/uploads/1/3/0/7/130739415/pivenajode.pdf
    • http://files.themarylandweddingmarketplace.net/uploads/1/3/2/3/132302759/ac422.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/55954431473.pdf
    • https://cdn.shopify.com/s/files/1/0431/4074/3329/files/20_appetizer_recipes_and_procedures.pdf
    • https://cdn.shopify.com/s/files/1/0436/2013/9170/files/tcp_server_python.pdf
    • https://cdn.shopify.com/s/files/1/0437/7831/0306/files/autocad_electrical_2014_tutorial_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/xikalagel.pdf
    • https://cdn.shopify.com/s/files/1/0429/2050/9596/files/esxi_embedded_host_client.pdf
    • https://cdn.shopify.com/s/files/1/0437/9734/8514/files/49711086399.pdf
    • https://cdn.shopify.com/s/files/1/0437/7464/0286/files/wumubifugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4365/1735/files/warigekudenaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6759/5165/files/vejopuvagebegizad.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_off00006c50.bin
79a1947c9faaef743fb4ff692bf8c85951f30bb1c69ef1ee96bbf7097b7fe7bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C50 5464 bytes
font_01_sfnt_off00007f0d.bin
e4fdf0e1d34c01290a6a26203f6b3a40eb1a7ab3deb948c94db186cf3be9fa79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0D 10076 bytes

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