Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4e8c690f30ec4a…

MALICIOUS

PDF

35.3 KB Created: 2020-08-08 03:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a67f08edcbaffbf8dbe931bb91040e2a SHA-1: 4348f391226909dc6f77b0d5b3d1641c40393a04 SHA-256: 9f4e8c690f30ec4aea506e28c3941962b5b58e851958087274a139488d1339a5
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to 'ttraff.ru', identified as a malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting the user to malicious infrastructure.

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=definite+indefinite+article+exercise+pdf
    • http://files.pureholisticharmony.com/uploads/1/3/0/7/130739490/zisivotelesubun.pdf
    • http://files.pagesfermentationsupply.com/uploads/1/3/0/7/130739690/2336004.pdf
    • http://files.gearupu.com/uploads/1/3/0/7/130776661/noxekezisoxofogogo.pdf
    • http://files.nataliebrite.com/uploads/1/3/0/7/130775137/weteji.pdf
    • https://cdn.shopify.com/s/files/1/0428/1961/6935/files/feden.pdf
    • https://cdn.shopify.com/s/files/1/0432/5595/5613/files/17821450902.pdf
    • https://cdn.shopify.com/s/files/1/0434/1117/7626/files/fomezel.pdf
    • https://cdn.shopify.com/s/files/1/0433/8774/8519/files/biodata_format_for_marriage_for_girl_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1413/files/snoop_dogg_da_doggfather.pdf
    • https://cdn.shopify.com/s/files/1/0436/8069/4437/files/59214660577.pdf
    • https://cdn.shopify.com/s/files/1/0433/0668/0484/files/rotelamanavora.pdf
    • https://cdn.shopify.com/s/files/1/0431/1633/1172/files/nulajalabavo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86562581376.pdf
    • https://cdn.shopify.com/s/files/1/0429/2981/5705/files/fapefigusud.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000042ec.bin
448557755677713f372ed9c53e09b20bb9e49074841936b3aa5e8dee135cffb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42EC 4896 bytes
font_01_sfnt_off0000539d.bin
e12141b555961b31deaa14ba0cfbeff40a4476693d9189127330d9a48f0e2793		 pdf-font-stream PDF embedded font (sfnt) at offset 0x539D 8856 bytes
font_02_sfnt_off000071f4.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F4 4324 bytes

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