Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9172dc28317809d…

MALICIOUS

PDF

39.1 KB Created: 2020-09-29 20:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c8b44fb856b868b4e6ed066299fc325 SHA-1: 34d5d09b19ea11a3c8cbc6d7f80db283ea1844e3 SHA-256: c9172dc28317809d11e50d1917cc39d46d3251e68f2821ee9a781bb4bc7c6356
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it is a malicious redirector. The embedded document body text, though heavily corrupted, contains a URL that matches the malicious redirector link. This strongly suggests the document's purpose is to lure the user to the malicious URL, likely for phishing or malware delivery. No scripts were extracted, limiting the analysis of the payload.

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=centrales+eolicas+del+ecuador+pdf
    • http://files.musicgnw.org/uploads/1/3/2/6/132696128/a59382dbf08a585.pdf
    • http://files.harthillhospitality.com/uploads/1/3/1/4/131406735/1380075.pdf
    • http://files.3ganfantasyfootball.com/uploads/1/3/1/3/131378776/22d18.pdf
    • https://site-1036939.mozfiles.com/files/1036939/88715954448.pdf
    • https://site-1036852.mozfiles.com/files/1036852/90796390514.pdf
    • https://site-1036945.mozfiles.com/files/1036945/kepuxofisivafaloko.pdf
    • https://site-1037233.mozfiles.com/files/1037233/4417405974.pdf
    • https://site-1037142.mozfiles.com/files/1037142/34929069269.pdf
    • http://guluf.loisfaber.com/uploads/1/3/2/3/132302842/9412562.pdf
    • http://files.onyxdirectcare.com/uploads/1/3/1/3/131379054/zovonubabi.pdf
    • http://files.adventuresinmiramichi.com/uploads/1/3/1/4/131483317/pakisenadados_munetove_vonatudax.pdf
    • https://uploads.strikinglycdn.com/files/f2ad2205-b146-45f2-9c3a-e750cabef5f6/14647096152.pdf
    • https://uploads.strikinglycdn.com/files/50c8663e-69b3-4019-9212-f80d153a8455/buwisewis.pdf
    • https://uploads.strikinglycdn.com/files/1d5a9fa1-4729-48ff-be03-76a8cd231a9a/banenigamerelutep.pdf
    • https://uploads.strikinglycdn.com/files/12ccebe6-00da-420b-9709-aa3c54e27e54/wenitatadakojunomave.pdf
    • https://uploads.strikinglycdn.com/files/054d6f76-3505-4434-8b1d-c8e3b452ac3e/dizininumo.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_off00005934.bin
ddb228dd9425a5544b6670d9c1f2efc472de84586f5c0156702dedb1e72c7467
pdf-font-stream PDF embedded font (sfnt) at offset 0x5934 5052 bytes
font_01_sfnt_off00006a6a.bin
dad221fbd80ea6294d771198d617a3a5b95c0ee3bdbddd85239769371d6280da
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A6A 10860 bytes