Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf17bdfa3d66d0b…

MALICIOUS

PDF

34.7 KB Created: 2021-06-20 09:39:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c71adbfd303941d1b40c422063558a60 SHA-1: 35afe1f701519b59e565ac583e776be8cd5d9460 SHA-256: cdf17bdfa3d66d0b754d6215d756dc1b422661e17eef5219095e7e1028e43466
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generator / game hack' lures. The primary malicious URL identified is http://netcdn.co/app/431946152/free-robux-vermillion-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious intent to redirect users to potentially harmful content, likely for malware distribution or phishing.

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.co/app/431946152/free-robux-vermillion-game-hack In PDF document text
    • http://muslib.unmus.ac.id//repository/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/daily-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/tiktok-free-or-paid_GM835599320.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/wurst-18-9_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/tiktok-free-auto-views_GM835599320.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/master-coins-free_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/pastebin-hack-robux-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/appsmobinfo-coinmasterhack-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coinmaster-free-cards_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/village-3-coin-master_GM406889139.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_off00003280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3280 21648 bytes
SHA-256: d67749a776fc08b52acce48ae2c8cbd2c4115bcf9a47b0e5fc000ee1e10ceea2
font_01_sfnt_off00006214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6214 19304 bytes
SHA-256: 963e8c4c3f1cb4041a5fcfee8c0641bac860466db8dca197eca20c48098356b2

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