Malicious PDF — malware analysis report

Static analysis result for SHA-256 b453a81a2cd1ca56…

MALICIOUS

PDF

35.2 KB Created: 2020-08-09 15:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d06d699ea8619a60f5c7fc243fea3b67 SHA-1: 0cdfadda1cff6d0eef2db6f4754b974f5a273cef SHA-256: b453a81a2cd1ca563a6d9b9d4c1e17141a22cb75e7c1c9f49a50bd4c3fef7a14
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, ttraff.cc. The document body, though heavily obfuscated, contains text related to file conversion, suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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.cc/pify?keyword=convert+pdf+to+word+adobe+acrobat+pro+x
    • http://dutum.hilltoppreschool.org/uploads/1/3/1/1/131164250/lewokasodutixoxa.pdf
    • http://files.cafedatalkalamode.com/uploads/1/3/1/4/131483550/3bbbf7.pdf
    • http://files.emugs.org/uploads/1/3/1/0/131070500/xegedebutisijaguv.pdf
    • http://files.hansenasphalt.com/uploads/1/3/1/4/131453574/668343.pdf
    • http://files.themagnificentseed.co.uk/uploads/1/3/2/6/132696113/zojazomewuseko.pdf
    • https://cdn.shopify.com/s/files/1/0436/9619/3686/files/wowisusutekowibevanufuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5598/0450/files/jaxojoref.pdf
    • https://cdn.shopify.com/s/files/1/0435/9503/8877/files/50033458188.pdf
    • https://cdn.shopify.com/s/files/1/0430/6475/4325/files/37577283462.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/craigslist_org_chattanooga.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/73138320724.pdf
    • https://cdn.shopify.com/s/files/1/0431/4402/0125/files/92356420229.pdf
    • https://cdn.shopify.com/s/files/1/0428/1355/4855/files/funepujudijuxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1284/0872/files/2259221795.pdf
    • https://cdn.shopify.com/s/files/1/0429/7090/6780/files/lugojexope.pdf
    • https://cdn.shopify.com/s/files/1/0430/3811/3955/files/nawanedinezonazopadejo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mogapusezonoxifetomo.pdf
    • https://cdn.shopify.com/s/files/1/0439/0813/7128/files/aines_selectivos_cox_2.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_off00004c17.bin
78f470e102d47c13182b6618c291455cb9b9423fa9735164ba85e89114101a14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C17 5204 bytes
font_01_sfnt_off00005dec.bin
a2be4794f5789f626c3ce11fcef80be001369b812e73aa88d75738a2c1c3b14e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEC 9416 bytes

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