Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fea66eb5e6a77a5…

MALICIOUS

PDF

45.8 KB Created: 2020-07-17 03:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36f028742552cd6a8090bafbd37036f0 SHA-1: eab0e98a9627d04fe25330998f8e66f445a87227 SHA-256: 4fea66eb5e6a77a50f88554d94cb378b45d56861d45bdbaac79145360e93b387
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources, likely to obscure the final malicious destination. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.cc/wb?keyword=manual%20therapy%20for%20physical%20therapists
    • http://files.dearborn411.com/uploads/1/3/2/7/132740860/xokagilo.pdf
    • http://files.isimonterey.org/uploads/1/3/1/3/131398605/jixurutiwexumud-pomijuzoze.pdf
    • http://files.zoomkidspalakkad.com/uploads/1/3/0/7/130776002/a5ea5f4d7645a.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/sogevi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4015/3505/files/relubenekinewopagumidased.pdf
    • https://cdn.shopify.com/s/files/1/0435/4385/5258/files/kepidigiluganubanefuzex.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xifadek.pdf
    • https://rifofapuw.files.wordpress.com/2020/07/93150859856.pdf
    • https://gujanatubo.files.wordpress.com/2020/06/vidulagalulomidibit.pdf
    • https://samizoz.files.wordpress.com/2020/07/33764843255.pdf
    • https://cdn.shopify.com/s/files/1/0431/2236/0469/files/fuliwokivila.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fakuwonilojovaxibudebu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5138/files/11654680882.pdf
    • https://cdn.shopify.com/s/files/1/0429/4439/7468/files/5344777463.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/pimerifoxeremavawofobiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/6107/6375/files/vuraxevemogozu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4262/6984/files/35208918141.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9837/files/bubiwowejonexopiximetuwe.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/
    • https://rifofapuw.files.wordpress.com/20

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075cc.bin
fad9f34e6367b620ea0109b72870b3d9811a6b0f633df7beac8615abb24c37f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75CC 5092 bytes
font_01_sfnt_off0000871e.bin
c1b933ff0cf0e809df83e7a4eb95828921524e0fcaf1122130d47926ed5c4747		 pdf-font-stream PDF embedded font (sfnt) at offset 0x871E 10332 bytes

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