Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb3601e55dbcf48…

MALICIOUS

PDF

41.1 KB Created: 2020-08-23 14:39:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac0a7f82f1501299c464236c23fdccc3 SHA-1: 47e2f8b30352cf39b4e1e988084ec193054968c6 SHA-256: eeb3601e55dbcf4841442207029a96d846757349ac1ca803d55be59a819fcc33
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=business+dictionary+book', suggesting a lure to a malicious site. The presence of a PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing further supports this. The ML classifier also strongly indicated maliciousness.

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=business+dictionary+book
    • http://files.johannes-keller.net/uploads/1/3/1/0/131070651/narigusofemuvuxafudu.pdf
    • http://jigagozos.cranbrookdistrictteachersassociation.com/uploads/1/3/0/7/130739163/61ba241a3.pdf
    • http://files.overheadcranesair.com/uploads/1/3/1/8/131871850/a8234cb5.pdf
    • https://cdn.shopify.com/s/files/1/0428/5038/6079/files/bollywood_latest_songs_website.pdf
    • https://cdn.shopify.com/s/files/1/0433/3659/7654/files/thanksgiving_worksheets_for_5th_graders_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/8916/4440/files/63044899364.pdf
    • https://cdn.shopify.com/s/files/1/0437/4714/7925/files/22849857875.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90685258811.pdf
    • https://cdn.shopify.com/s/files/1/0430/3290/3829/files/50830630724.pdf
    • https://cdn.shopify.com/s/files/1/0436/8583/9003/files/27426799509.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_off00006417.bin
72569213cf23a96b44f9452b7515cc02a99995aa5a96121b19110579a60b508c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6417 5256 bytes
font_01_sfnt_off00007603.bin
957cc67684d424c631aa33f7620c07441f8c74ceb4d58567a79ff71302d0f55b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7603 10088 bytes

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