Malicious PDF — malware analysis report

Static analysis result for SHA-256 7664a00464723ce0…

MALICIOUS

PDF

66.1 KB Created: 2020-07-28 05:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10b02b05a067aa88722413576f4da602 SHA-1: ce4d96cf8a42a565e87b78fb917caf47c3d4bb9b SHA-256: 7664a00464723ce01e0e89b4e0ce3a68e53cc9ff76e73da3a4c6d983afc137d5
152 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic firing for a PDF link farm. One of the primary links directs to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, suggests a lure related to 'Biodegradation pdf file', likely an SEO tactic to attract unsuspecting users. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=biodegradation+pdf+file
    • http://files.111-ed.com/uploads/1/3/0/9/130969897/wugunovigapopenikedi.pdf
    • http://files.michellehutchinsonart.com/uploads/1/3/0/7/130775441/3071664.pdf
    • http://files.coragulachouse.com/uploads/1/3/1/0/131070331/ziparabifob-veduvozal-fuzabepi-wejuzesemuboze.pdf
    • http://files.teresaruchdesigns.com/uploads/1/3/1/4/131438055/870135.pdf
    • http://files.kingsporthorses.com/uploads/1/3/1/3/131383553/1742861.pdf
    • http://files.teresaruchdesigns.com/uploads/1/3/1/4/131438055/870135
    • https://cdn.shopify.com/s/files/1/0439/1917/9931/files/jofuwenub.pdf
    • https://cdn.shopify.com/s/files/1/0428/4956/6886/files/2528537199.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8658/files/82711438204.pdf
    • https://cdn.shopify.com/s/files/1/0440/2990/2998/files/zatuladigaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/0491/8941/files/90811836608.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0976/files/sozirijogojiwadibixugapo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81274949660.pdf
    • https://cdn.shopify.com/s/files/1/0437/8787/8549/files/5249945998.pdf
    • https://cdn.shopify.com/s/files/1/0429/4947/6518/files/30780673629.pdf
    • https://cdn.shopify.com/s/files/1/0435/4991/7333/files/11863501892.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/zusokapozedutazujobugi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7845/1351/files/jaxoxugu.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_off0000c614.bin
3b516eb69eabdd4bc51ceef83c61997f993966fc2788c946481ef9ca836db14a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC614 4868 bytes
font_01_sfnt_off0000d6aa.bin
d7406d2e259b4a31f1407f88fcccaf9b14252ff41c19654c5c2e77edcac820e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AA 10632 bytes

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