Malicious PDF — malware analysis report

Static analysis result for SHA-256 a294b1f5604969b2…

MALICIOUS

PDF

41.1 KB Created: 2020-08-02 11:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aefdea0fdb98d4d09a0be07ac5453f9c SHA-1: b29a01923f016b9dbd3173b49cab8bd815413a10 SHA-256: a294b1f5604969b2fc7a4edc5026b0dd8b5c96fcfddf81ea3c1afb2ac337ed21
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. This pattern is indicative of a link farm or SEO poisoning attack, designed to either boost search engine rankings or lure users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=dart+socket+server
    • http://files.blankthehub.com/uploads/1/3/0/9/130969967/rironaverexowamuk.pdf
    • http://files.jakegrahamphotography.com/uploads/1/3/2/6/132696155/popekuwuk-nanudetirava-zigomevu-morix.pdf
    • http://files.larimervoad.org/uploads/1/3/2/6/132696598/gogikewuj.pdf
    • https://cdn.shopify.com/s/files/1/0436/9950/3257/files/xijudevuxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4520/7714/files/fazutuzuvukepi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0147/1388/files/34533351519.pdf
    • https://cdn.shopify.com/s/files/1/0440/6712/7446/files/9165378685.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1935/files/97045229225.pdf
    • https://cdn.shopify.com/s/files/1/0431/4673/9878/files/xavater.pdf
    • https://cdn.shopify.com/s/files/1/0434/7337/1300/files/bubepapekomo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4249/5895/files/jusotajonawerevasudawek.pdf
    • https://cdn.shopify.com/s/files/1/0430/5318/7223/files/kubuxojuzulukupa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6780/1749/files/furavumef.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/38686093626.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nujogopuju.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5965/files/nopigovopelutuxa.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_off00006344.bin
774be6c79e4677feca80b8b16389d32732d55afd9ba58da612941b53bf45d116		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6344 4884 bytes
font_01_sfnt_off00007401.bin
070746bb8e01b901b59f757f945ebb1d75d34d89f3d512ec596b1cc80ef032c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7401 10556 bytes

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