Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73b69d3c0613e44…

MALICIOUS

PDF

39.5 KB Created: 2020-08-25 04:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acdf5c3d11f3f43622c105899fb889ba SHA-1: b3b7b4fa7f07288792d51f1410fa0da306887c09 SHA-256: b73b69d3c0613e446bef1dd9318e4afd97f113376339b99ae14a051b1001204f
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL. The PDF also exhibits characteristics of a link farm, with numerous embedded links, many pointing to Shopify domains, likely to improve SEO and disguise malicious intent. The primary malicious IOC is the redirector URL, which likely leads to further 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.com/pify?keyword=dehydration+of+alcohol+lab+report+conclusion
    • http://files.threeatlantacats.com/uploads/1/3/1/4/131438079/viwebipizinowi_dironaxe_janojawumuwasi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8098/2438/files/cambio_de_a_word_i_love.pdf
    • https://cdn.shopify.com/s/files/1/0439/2180/1371/files/backyard_baseball_2001_mac_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8525/9159/files/iso_aperture_shutter_speed_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0439/9398/9278/files/mutabarulejaxaniti.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/xonufapu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3564/0487/files/rijuxonisarujowasive.pdf
    • https://cdn.shopify.com/s/files/1/0440/7610/5893/files/rojuzilitumabibudotediv.pdf
    • https://cdn.shopify.com/s/files/1/0438/9850/3336/files/jaretid.pdf
    • https://cdn.shopify.com/s/files/1/0430/9178/7937/files/swing_trading_books.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4155504299.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_off00005d13.bin
5a1b995c4343ce2151c003de675179ce4980a9e0c5b3f45558c2253b7f763cd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D13 5484 bytes
font_01_sfnt_off00006fb4.bin
214a48dc6bec217f7fbccbe1b35af4c41879902c11f04d5c06b4dbb0e7f1ee2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB4 9872 bytes

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