Malicious PDF — malware analysis report

Static analysis result for SHA-256 905f8f211249b256…

MALICIOUS

PDF

35.3 KB Created: 2020-09-30 16:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3535f7a20da94d738c0fb2934fd4b086 SHA-1: 1ad59acefa9d2c52e0474ec066b9f5fe817f42c3 SHA-256: 905f8f211249b25630cccb979c33e9fbb9aac492d9a5169be29f10be509b9b72
92 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ggtraff.ru, which is disguised as a search result. This indicates a phishing or social engineering attempt to lure the user to malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious URL is sufficient evidence for the attack pattern.

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.
  • 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://ggtraff.ru/strik?keyword=carnatic+violin+notes+for+malayalam+songs+pdf
    • http://files.uvicscuba.com/uploads/1/3/0/7/130739836/jodof_bimewoxotezad.pdf
    • http://soguzenob.dkuntz.com/uploads/1/3/2/8/132816202/duwimofudu-fonodejojota.pdf
    • http://files.shaun-evans.com/uploads/1/3/1/0/131070849/rusug_lutesuxon_jubegijakoxu_nafabiluvuduxi.pdf
    • http://files.tochnorthernregion.org/uploads/1/3/0/7/130775402/7fb67d0bbfe3b.pdf
    • http://jorekaz.sport4lifecochrane.com/uploads/1/3/0/9/130969754/b0546be47.pdf
    • http://files.massagebyaxil.com/uploads/1/3/1/3/131383456/0ccd6bf934cda5b.pdf
    • http://files.efmlawcompany.com/uploads/1/3/1/6/131606155/c29f6a84.pdf
    • http://bajeraxu.myschoolofkindness.com/uploads/1/3/2/6/132695569/jeripifijilesiv-gepibeg.pdf
    • https://uploads.strikinglycdn.com/files/9f814879-182f-41af-9a2f-588d37579d30/visuvusumaw.pdf
    • https://uploads.strikinglycdn.com/files/b2165415-a22b-4f60-b230-b7583274fd78/suviv.pdf
    • https://uploads.strikinglycdn.com/files/185c4929-2b77-4cb4-8319-7b37b6c6eceb/54952005184.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_off00004a9e.bin
2d7d4e50e2044da871a463c1c42baee8706d37c63f234157b82a70dc785ca47f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A9E 5540 bytes
font_01_sfnt_off00005d6c.bin
95bd8877ece31ffbac5e3368c20d1fefe772137d6b1af5ccb7e869a82bf23f7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6C 10244 bytes

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