Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a1019b776832eb…

MALICIOUS

PDF

51.7 KB Created: 2021-06-07 20:15:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a734e611663bf6ee3ad807c372a9aaed SHA-1: 79ee6137dde82eb1182ef6924b018b34e702e7bd SHA-256: 21a1019b776832eb09cdab7bac109e0d27018c127311adede0d86cf59d468415
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as 'game hacks' or 'free generators'. The primary lure is related to hacking Roblox accounts, directing users to a URL that likely serves further malicious content or exploits. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9464

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.tw/app/431946152/how-to-hack-an-account-on-roblox-2021-game-hack In PDF document text
    • http://stpc.it/images/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • http://stpc.it/images/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • http://stpc.it/images/real-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/are-tiktok-free-views-without-verification_GM835599320.pdfIn PDF document text
    • http://stpc.it/images/haktuts-coin-master-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/coin-game_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://stpc.it/images/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/how-to-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/free-custom-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://stpc.it/images/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/robux-claimer_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://stpc.it/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000502d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x502D 34168 bytes
SHA-256: 0ae63253f93a0f3fafe6ac7455075a556175bbd3e11baf8b2d7b5e833d2ed87f
font_01_sfnt_off00009b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B42 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off0000a52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA52D 18992 bytes
SHA-256: 26d393feb2ac6d8e7a154684d0cca4fc97c79c486de4b8ba45de023ef88c04dc

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