Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2120ac16d5d311…

MALICIOUS

PDF

34.0 KB Created: 2021-07-05 10:06:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 21b9441fcdc56303c6907eb4c4c25377 SHA-1: be3cebefd6058af67cc9c1c8da07c6f23575acfe SHA-256: ec2120ac16d5d3117f18e5ecca86b7577de82b30427bdac5a2c4b4b7b042d419
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links, including one pointing to 'netcdn.tw', which is flagged as a malicious redirector. The document body and heuristics indicate a lure for game hacks, specifically 'Coin Master Hack', to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

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/406889139/coin-master-hack-ios-reddit-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-sites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/freemobile-360info-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-hack-mod-apk-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/como-hackear-roblox-rapido-y-facil_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-free-ss-excutor_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/does-roblox-sense-cheat-engine_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/play-coin-master-online-free_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/purest-roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-flip-master-coins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-rape_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
stream_002_off00002fc2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FC2 22596 bytes
SHA-256: 9920ad1e71092a352776f5e4a99b823ff5f7a419ff10774ce39423e17a3e3550
font_01_sfnt_off0000625d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x625D 18180 bytes
SHA-256: 36a5529bcec1a9ebfeb67e8a1c9eb6b6afb40cca80507846db0d415d086f7376

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