Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97a01c804aa99ce…

MALICIOUS

PDF

43.1 KB Created: 2020-08-11 14:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a23fb967b035d07df2c3e3472cd0a2c7 SHA-1: 1695fec36a5b913d6f14a5bb9dfab122ea8c68b5 SHA-256: f97a01c804aa99ce18f5d226d98febdfb1514fea8fc0ea3c3cbf50bb8040565c
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, specifically pointing to 'https://ttraff.cc/pify?keyword=calculus+books+pdf+free'. This indicates the document's primary purpose is to redirect users to malicious infrastructure under the guise of providing a free calculus book. Additional heuristics confirm the presence of a link farm and general maliciousness. The document body, though heavily obfuscated, also contains the same redirector URL and other suspicious URLs.

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.cc/pify?keyword=calculus+books+pdf+free
    • http://kivot.bensonbunnies1971.com/uploads/1/3/1/4/131453109/8437979.pdf
    • http://files.timothymperez.com/uploads/1/3/2/6/132681985/kovafasufuvapedizar.pdf
    • http://files.givehim5.net/uploads/1/3/0/7/130739951/jejodenogego_tugasa_nozegevadatuba_sepov.pdf
    • https://cdn.shopify.com/s/files/1/0437/0097/7816/files/70914876807.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/sowuda.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/legivitaruj.pdf
    • https://cdn.shopify.com/s/files/1/0434/6730/9206/files/44420829170.pdf
    • https://cdn.shopify.com/s/files/1/0432/4940/2016/files/widixexedonose.pdf
    • https://cdn.shopify.com/s/files/1/0429/6117/4687/files/34778673445.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/68296725111.pdf
    • https://cdn.shopify.com/s/files/1/0437/8882/8829/files/heroku_rename_app.pdf
    • https://cdn.shopify.com/s/files/1/0440/6178/6262/files/engineering_abbreviations_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/8747/0499/files/epfo_registration_form.pdf
    • https://cdn.shopify.com/s/files/1/0436/1981/1490/files/anesthesiology_img_friendly_residency_programs_list.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_off00006300.bin
9240b6e0bc7def2521cabbf83d0bf3a33634cfd9e94df7d56981d5e50242ef32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6300 5256 bytes
font_01_sfnt_off000074e3.bin
52e0c849ea1f2bbe9b3116d133545fd15cc5f0ff68307b5b7b53f5f69cd24391		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E3 13704 bytes

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