Malicious PDF — malware analysis report

Static analysis result for SHA-256 980843eee69a305c…

MALICIOUS

PDF

36.6 KB Created: 2020-07-08 11:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cee5cd62b9c9fc836dfa20a377981907 SHA-1: 2d1cbe971c6b12187ba35384c244b15d0a180a57 SHA-256: 980843eee69a305c52bb85094bc7f62989d2e1a8be534ac7e72f6baa8939c767
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The document body, though obfuscated, contains keywords related to textbooks and URLs, suggesting a lure to trick users into clicking malicious links. 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.ru/wb?keyword=dutta%20obstetrics%20textbook%20pdf
    • http://files.innovationsbuildingservices.com/uploads/1/3/1/4/131438741/3ca2f8128cf.pdf
    • http://files.nomadicsteve.com/uploads/1/3/1/4/131437538/42cb4690f8.pdf
    • http://files.geomaticsworkshops.com/uploads/1/3/0/7/130775053/xiluzakewunuxat.pdf
    • http://files.kitalerafiki.com/uploads/1/3/0/8/130873830/kovov_tefusegojiwenav.pdf
    • http://files.thebetterbrasspipe.com/uploads/1/3/2/7/132740218/daf3e1d8396c143.pdf
    • http://files.mairibudreau.com/uploads/1/3/0/7/130776864/ziwawajobigogefivane.pdf
    • http://files.thefashionanalyst.com/uploads/1/3/1/3/131383624/wezunawe.pdf
    • https://bikerikotad.files.wordpress.com/2020/07/79888114053.pdf
    • https://tilakomo.files.wordpress.com/2020/06/xinitigisel.pdf
    • https://gilolarezuj.files.wordpress.com/2020/07/73385392092.pdf
    • https://rokonofivadi.files.wordpress.com/2020/06/sowagurovuzewopixivi.pdf
    • https://buluzoti.files.wordpress.com/2020/06/gopiliba.pdf
    • https://nopozofura.files.wordpress.com/2020/06/37339170019.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_off0000535c.bin
40cb6fd234efcd5d84797cd4f150644a843c4036f842d02e9edeb3e4115cc6a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x535C 5164 bytes
font_01_sfnt_off00006506.bin
04345921a08ed2ad96ccaf8a1990697aa0366479e27d4f4e2d07548902b55945		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6506 9764 bytes

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