Malicious PDF — malware analysis report

Static analysis result for SHA-256 631bae50e120eaa5…

MALICIOUS

PDF

35.3 KB Created: 2021-06-19 12:53:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 175e2a4af2ff825dec03c840278dd81b SHA-1: 69cfc46b02d7593712a4adf8e98e8138f565c517 SHA-256: 631bae50e120eaa59dc37fc5a7f1ccb819805f8020d06d042662e73df165d042
180 Risk Score

Malware Insights

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

The PDF contains multiple links to websites offering game hacks and free currency, identified as malicious redirectors. The document body and embedded links strongly suggest a lure for users seeking cheats or exploits, which is a common social engineering tactic. The malformed stream length heuristic indicates potential exploit code within the PDF structure, likely intended to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/dungeon-quest-roblox-hacking-game-hack In PDF document text
    • http://lib.mappifhui.org/repository/minecraft-hacked-client-bedrock_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/roblox-tix-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-be-spongebob-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/mistplay-robux_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/hack-para-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-attack-madness-hack_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/is-roblox-hacked_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/minecraft-for-macbook-free_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/hack-to-bypass-roblox-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-fan-page-giveaway_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/cheat-codes-for-prison-escape-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/roblox-admin-script-hack-pastebin_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_off000031ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31CE 22508 bytes
SHA-256: 4fa42f32093fc73a1dd1eb4767074ebca74ac2238cf015e45750b7f46e3b66ab
font_01_sfnt_off000063f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F0 19344 bytes
SHA-256: a6f54b881b4692fc00d33d3b1202156930f6567a1fd3b011d5a6f70bc30fb51c

Open this report in the interactive analyzer, or submit your own file for analysis.