Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc6762cd34a95dc…

MALICIOUS

PDF

42.5 KB Created: 2021-05-19 10:02:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9e1650e0c6f35b771ea5a5245baffd81 SHA-1: 8c0d2142ce5cf2b9e080fd6a0a2debe0750cad70 SHA-256: cfc6762cd34a95dc5bd4337940bbb169913e79983fe85ef4826ae6558d787d92
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on them, promising free Robux or game hacks. These links redirect to known malicious infrastructure, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/free-robux-place-game-hack In PDF document text
    • http://stpc.it/images/daily-free-spins_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/tiktok-free-hosting_GM835599320.pdfIn PDF document text
    • http://stpc.it/images/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/free-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/coinmaster-spin-ml_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/collect-robux_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/coin-master-ad_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/free-spins-on-coin-master-app_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • http://stpc.it/images/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/coin-master-hack-pro_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/free-robux-offers_GM431946152.pdfIn PDF document text
    • https://www.nrzroblox.comIn 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_003_off0000463e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x463E 26764 bytes
SHA-256: c330b9947d4abc4923152e32bc7f2ac7a54411fe5dbf6af9e9f82687fbf72f96
font_01_sfnt_off0000834c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x834C 18472 bytes
SHA-256: a8315d3de564ce67f995c8887965c7d9f34366905f839248eafe88b792a59691

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