Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cddc4e4c0d962c2…

MALICIOUS

PDF

33.9 KB Created: 2020-08-12 00:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b832d40e90afe7631093ead2bcce6de6 SHA-1: 00c126d20163bfdc1d7e30d401ef2758ed381a7d SHA-256: 8cddc4e4c0d962c2508673c265d71ad1d44f5e5019b84484aeeede1dc48c1950
150 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector at 'ttraff.com'. The document body text, though partially corrupted, includes the phrase 'clinical cases in anesthesia pdf free download', suggesting a lure to trick users into clicking the malicious link. The presence of a link farm and a critical heuristic firing for a malicious redirector strongly indicates a phishing or redirection attack.

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=clinical+cases+in+anesthesia+pdf+free+download
    • http://files.chensbadmintonclub.com/uploads/1/3/1/4/131483002/zuturofukalu_rubobowegu_baxofedap.pdf
    • http://files.davertskate.com/uploads/1/3/0/7/130739379/5568701.pdf
    • http://files.maypalacevail.net/uploads/1/3/1/3/131398251/zaludok.pdf
    • http://files.stitchedwithcare.com/uploads/1/3/1/3/131383624/dowumi-wefudazebukop-wivavin-tajewowe.pdf
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/puvolevepo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0406/6983/files/55368024755.pdf
    • https://cdn.shopify.com/s/files/1/0429/1641/3607/files/20330318761.pdf
    • https://cdn.shopify.com/s/files/1/0435/6443/3566/files/29255819051.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/raditenonogexakamozaweses.pdf
    • https://cdn.shopify.com/s/files/1/0428/2286/0956/files/18953121864.pdf
    • https://cdn.shopify.com/s/files/1/0432/1561/8203/files/18608031532.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1384/files/97090205843.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/69010587356.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wajafaliwufenosikem.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_off0000472b.bin
209edf2b641d5cdfc3c97e44ad3d345989995ceeadc9d2c502fa6f52fda89067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x472B 5240 bytes
font_01_sfnt_off000058fb.bin
08592f06eafa232a9a32789f519bad443afba190a1820c2f72ea6d99b0d79829		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58FB 9884 bytes

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