Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ddd7bd0ce0b6c9…

MALICIOUS

PDF

34.7 KB Created: 2021-06-19 12:08:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f2a2e8df4d7bbe8e5783637f6bcaaa13 SHA-1: 4a1d631eed8bf7c10cf5b38b185a1a028fc847b5 SHA-256: 90ddd7bd0ce0b6c9c084d80186c9836e627dd7c7ce01fa9cb4980bb7679856d8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free game hacks and generators. The primary malicious URL identified is http://netcdn.co/app/431946152/robux-free-com-game-hack, which is associated with a high-risk score. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt, likely leading to further malware download or credential harvesting.

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/robux-free-com-game-hack In PDF document text
    • http://bw.ac.th/userfiles/files/rewards-robux_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-spins-coin-master-2021-app_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-coin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-hack-extension_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/collect-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/caught-my-mom-cheating-in-roblox_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/get-free-robux-no-human-verification_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_off00002ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF7 22744 bytes
SHA-256: 9228398e549e20e1d7539e8688a3b498d2c1502fe54c3437ff9ca02abe33e977
font_01_sfnt_off000062c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C8 18976 bytes
SHA-256: fb86ad1aad47c5a5c5fa913efd771066ff8edf92cff8bf075126ed023f1935f6

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