Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a872b36c98465e4…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 18:58:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4f8b92193e878c262257a0a9d96da6b5 SHA-1: 1386cad0d44b112d82e57fd7ddbca481a383cf77 SHA-256: 7a872b36c98465e485d2eee916611bd09b48e869a309edbe564df658819a506b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple embedded links, including one identified as a known malicious redirector. The document body and heuristics indicate a lure for 'free generators' or 'game hacks' to trick users into clicking the malicious link. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://netcdn.tw/app/479516143/free-domain-for-minecraft-server-game-hack In PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-roblox-followers-generator-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-admin-panel-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-t-shirt-design-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/infinity-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spin-link-list_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-do-you-get-free-stuff-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/800-robux-free-pub_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/robux-hack-no-human-verification-2021-or-survey_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-magical-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-free-girl-body_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000304b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x304B 23060 bytes
SHA-256: 002751fa9125858a3f12218916dfef9cb6a3449e19a4fb702840ec5f2467901e
font_01_sfnt_off00006460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6460 18540 bytes
SHA-256: f2c0b7b5faec8b62416b2a1cff0b02c1c3876075283a1c3e7f779e2a54051aa5

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