Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e78cd4c72cb455…

MALICIOUS

PDF

41.5 KB Created: 2020-08-05 11:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a50dc23ce2b5780c736bdd553f4f131e SHA-1: e6a2640e6da4808b7b03073815a2bfc64ff4db76 SHA-256: c8e78cd4c72cb455f4ceb36e93c1c7b9dcf917312bd4effff46ae739d5a6d651
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 pointing to 'ttraff.ru', which is used in a lure for free software downloads. Additionally, a large number of external PDF links were found, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and a URL that appears to be part of the redirection chain.

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=editing+pdf+file+software+free+download
    • http://files.spiritofthe8thfire.com/uploads/1/3/0/7/130739371/64d918.pdf
    • http://files.avacone.com/uploads/1/3/2/7/132740293/44129509e5.pdf
    • http://files.westsideindustrialpark.com/uploads/1/3/0/8/130874276/5507050.pdf
    • http://files.shandeezcollectiv.com/uploads/1/3/0/9/130968984/kewugifo-pulodabimog.pdf
    • https://cdn.shopify.com/s/files/1/0440/6280/2070/files/80884315594.pdf
    • https://cdn.shopify.com/s/files/1/0434/4050/4999/files/que_son_los_chakras_y_para_que_sirven.pdf
    • https://cdn.shopify.com/s/files/1/0432/8462/7624/files/92273061305.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4562/files/34356609401.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3238/files/41771132421.pdf
    • https://cdn.shopify.com/s/files/1/0430/8133/4933/files/77127944094.pdf
    • https://cdn.shopify.com/s/files/1/0440/5726/4280/files/39223045063.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/46594457216.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/medade.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/kopekoxinigowep.pdf
    • https://cdn.shopify.com/s/files/1/0432/7240/5157/files/palaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/zivuregejasudadijozolaxep.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_off000064a4.bin
6c13141554b3303905fa31dea51c6b341c39bd58b68a22c432568e4642efa879		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A4 5256 bytes
font_01_sfnt_off000076b2.bin
19fae8ef8347d709bcd1e7269eab938509b1a17fdc9ea6acb6963b90f34e81fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B2 9932 bytes

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