Malicious PDF — malware analysis report

Static analysis result for SHA-256 23aa6c08259c82c3…

MALICIOUS

PDF

50.0 KB Created: 2020-07-30 02:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c20de73df6ff4e48cf7337cb11c4854f SHA-1: 671a2a17dc3e0851c22a55ded07065d7b22ad9a8 SHA-256: 23aa6c08259c82c325ba83202e69e0ad1619efab650f12a02b8adf6b9ae188b3
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on Shopify, designed to direct users to various resources. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which is likely used to obscure the ultimate destination. 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 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=ataxia+telangiectasia+tratamiento+pdf
    • http://files.eganvillerotary.com/uploads/1/3/1/4/131406036/46756.pdf
    • http://files.quiltsbyj.com/uploads/1/3/1/6/131636916/gapas_nimosakiwekejur_dabomafesam.pdf
    • http://files.advancedanaerobics.com/uploads/1/3/0/9/130969555/davam.pdf
    • http://files.ohltownumc.com/uploads/1/3/1/4/131438427/5590336.pdf
    • http://files.eganvillerotary.com/uploads/1/3/1/4
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/kaxopiwifug.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/23803634891.pdf
    • https://cdn.shopify.com/s/files/1/0433/7660/7390/files/kapado.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/31601948641.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0758/files/18456104797.pdf
    • https://cdn.shopify.com/s/files/1/0433/7722/9982/files/zabukotajelojatulid.pdf
    • https://cdn.shopify.com/s/files/1/0435/7177/3601/files/44974875884.pdf
    • https://cdn.shopify.com/s/files/1/0437/8089/8973/files/gonegofatijefilesugiwoni.pdf
    • https://cdn.shopify.com/s/files/1/0431/0292/9047/files/mulelonoliza.pdf
    • https://cdn.shopify.com/s/files/1/0429/2401/5783/files/44380949609.pdf
    • https://cdn.shopify.com/s/files/1/0430/8477/5577/files/29506703738.pdf
    • https://cdn.shopify.com/s/files/1/0428/4828/8934/files/tobaworagagozuvovewem.pdf
    • https://cdn.shopify.com/s/files/1/0432/1063/7475/files/weselavibumaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/4470/8245/files/zepefigadozizobefakuja.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/bapetexupogugamenaronuw.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_off000085e9.bin
4cca4a06319fb05cf6b74a74734bacf4e8e0a6881900315cea3faa4102d9d4b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85E9 5320 bytes
font_01_sfnt_off000097e5.bin
0519d481c654bf7145366382daa12cf47a326a4439c473f79bf73cfee0beec51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97E5 10200 bytes

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