Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67dc539d1f57fbf…

MALICIOUS

PDF

39.0 KB Created: 2020-08-22 18:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28bec156543eeeb60ea7a2029a9f4516 SHA-1: 026b4abbb75e2049b92cd3314205a8a7c69382be SHA-256: d67dc539d1f57fbf59dbe38b0e1f5309013de58c6e36808efe94b5ee7a115eff
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used to obscure malicious destinations or to create link farms for SEO manipulation. One of these links redirects to 'ttraff.com', which is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains references to 'Aurora teagarden books' and the redirector URL, suggesting a lure. The ML classifier also strongly indicated 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.com/pify?keyword=aurora+teagarden+books
    • http://files.louiseartist.com/uploads/1/3/0/9/130969080/6049120.pdf
    • http://files.enuffnonsense.com/uploads/1/3/0/8/130814581/biroranomu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3568/files/liquido_amniotico_fisiologia.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96056065099.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/79109814930.pdf
    • https://cdn.shopify.com/s/files/1/0431/4352/8609/files/linux_shell_scripting_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0433/4436/3678/files/45982472154.pdf
    • https://cdn.shopify.com/s/files/1/0432/6365/6099/files/how_to_blink_wikihow.pdf
    • https://cdn.shopify.com/s/files/1/0431/6528/6549/files/91793003577.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/93467974983.pdf
    • https://cdn.shopify.com/s/files/1/0431/5319/5165/files/94663482664.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_off00005d1b.bin
90c37a0257f483ba79b67b917f7bd854d2655f2ad78ca7d79a152f756933f78f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1B 5152 bytes
font_01_sfnt_off00006eac.bin
e0af3f22c00594b6a24914730e204909694f0108ed39d50e07ece9aab399f3e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAC 9652 bytes

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