Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d3ebcf040317bb…

MALICIOUS

PDF

43.5 KB Created: 2020-08-02 19:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be24e420328e716e58ada35dbca69a64 SHA-1: 12ad0639538a2aa1b498202d5d60c46fedf28d2a SHA-256: a7d3ebcf040317bb52696f03844b46208ecbf79ca03c5ccc2c1de77fcd30946e
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.ru/pify?keyword=marieb+anatomy+and+physiology+lab+manual+pdf', is designed to redirect users to potentially harmful content. The document also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many pointing to Shopify domains, suggesting an attempt to obscure the final destination or leverage legitimate platforms for distribution. The ML classifier strongly supports the malicious nature of this PDF.

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=marieb+anatomy+and+physiology+lab+manual+pdf
    • http://files.weruntheforest.co.nz/uploads/1/3/1/4/131438449/3159437.pdf
    • http://files.centrepointecincinnati.com/uploads/1/3/1/4/131406413/e08b8.pdf
    • http://files.babacoolpc.com/uploads/1/3/0/7/130775109/6080772.pdf
    • https://cdn.shopify.com/s/files/1/0428/8456/3110/files/48766081901.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/81159380938.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/jasupulijufiwibigumuzegoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/buforolexo.pdf
    • https://cdn.shopify.com/s/files/1/0440/8963/9077/files/79804528978.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/48195915598.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/95610310087.pdf
    • https://cdn.shopify.com/s/files/1/0439/4654/1211/files/jijuxuvigejo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2126/3271/files/96148200370.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/pamagomuxafavalokobo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5479/2866/files/97925394077.pdf
    • https://cdn.shopify.com/s/files/1/0429/2942/2499/files/40840649086.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_off000069da.bin
46d35a8f312d4f768f5209c456957c149f18804ba9cc646eb0696fa786fe2d1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69DA 5704 bytes
font_01_sfnt_off00007d27.bin
bb94c4d515d7b68fc33889fb651d22655c94d6851504ba55600449a25b15ceff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D27 10524 bytes

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