Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a7de3b6b2fabf2…

MALICIOUS

PDF

44.3 KB Created: 2021-06-08 16:58:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2374ddb77dcda36cb9ee90056515c848 SHA-1: 42d8748267eed24980f9b1aeb4048eb1138c0cde SHA-256: 23a7de3b6b2fabf2e910627f36574d1d81da5e10fe44d2f6880607e558860cf9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, disguised as a 'free generator / game hack' lure. The document body and embedded links suggest a phishing attempt to trick users into visiting malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/get-free-robux-2021-easy-game-hack In PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-rules_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-login-password-hack_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/easy-way-to-get-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-client-download_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-daily-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/fake-robux-codes_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-app_GM406889139.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_004_off00004e91.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E91 25176 bytes
SHA-256: d90687999081d73201fb9eddf46aef58823c7d7efed1bd363a6b8da52af7c2f5
font_01_sfnt_off0000883a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x883A 18928 bytes
SHA-256: ba9623282458f7e93ec6fabd2fe97518fc9dd288100c35ec4faaeb9b94310855

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