Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf9990f66744e82…

MALICIOUS

PDF

35.0 KB Created: 2020-08-22 05:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f21010a4277c83543b36b28fbab670d SHA-1: d3c833ac9cd3229eb00f246a97d63fc9805ec82e SHA-256: edf9990f66744e82b1e0414f1f18e3e87c2bfa6938106d34b8c7f6a3102cdc8d
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting an SEO manipulation or link farm tactic. The primary malicious link identified is https://ttraff.com/pify?keyword=crackling+sound+effect+free, which is likely used to redirect users to further malicious content. The ML classifier also strongly indicated maliciousness.

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=crackling+sound+effect+free
    • http://kijexesuw.bellsgc.com/uploads/1/3/0/8/130874523/5608533.pdf
    • http://sogufin.fatdogsoapworks.com/uploads/1/3/2/8/132815176/ce50d.pdf
    • http://files.trenchninja.com/uploads/1/3/0/9/130969399/772008.pdf
    • http://lotavejov.alphaomegamartialarts.org/uploads/1/3/0/7/130776485/5991756.pdf
    • http://files.stephaniemadeira.com/uploads/1/3/1/8/131856919/5082427.pdf
    • https://cdn.shopify.com/s/files/1/0433/5576/6942/files/nibevuvol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87463685859.pdf
    • https://cdn.shopify.com/s/files/1/0447/1724/4570/files/owners_manual_ford_fusion.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4155504299.pdf
    • https://cdn.shopify.com/s/files/1/0431/9635/0624/files/biopsicologia_de_la_emocion.pdf
    • https://cdn.shopify.com/s/files/1/0431/0640/2453/files/87614454794.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3861/files/nifosegekevubewixenusiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/2449/9367/files/namoger.pdf
    • https://cdn.shopify.com/s/files/1/0450/8614/6712/files/58228472131.pdf
    • https://cdn.shopify.com/s/files/1/0434/7278/1478/files/77278433461.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4688/files/togav.pdf
    • https://cdn.shopify.com/s/files/1/0432/4327/4402/files/jomikozamexexazu.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_off00004d53.bin
215e038485e782850b2542ee096df377b0eee951eb58bc8e3778932e0a49065b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D53 5160 bytes
font_01_sfnt_off00005ee3.bin
3165b145f76d0c565882673c960e5c09c7c9ee75d8182341d71a731b2d2e07ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE3 9708 bytes

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