Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c1a91c96cac24a…

MALICIOUS

PDF

34.2 KB Created: 2021-06-18 04:55:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c5750168ec15c21db0648ccd509dbf43 SHA-1: 36ab599d9ecc5dc20017e639c8d2c01aab8c97d1 SHA-256: 13c1a91c96cac24a7079f460876dfa2b0e0559a8449fb05461d42f5dbfa003c6
160 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators' to lure victims. The ML classifier strongly indicated maliciousness, and the presence of redirector links confirms a malicious workflow. No scripts were extracted, but the document's structure and embedded URLs suggest it's designed to lead users to potentially harmful content or further exploits.

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/how-to-hack-bots-roblox-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/50-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-hack-m-coins-mcpe-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/hack-roblox-ninja-legends_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/youtube-free-roblox-account_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-112-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/play-roblox-free-online_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/hack-robux-hack-hack_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/get-free-robux-without-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-promo-codes-2021_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_off00002f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F88 22124 bytes
SHA-256: adc2062bfe89d380ffd30ad869bb0567f7995743215e676176c9d64a4804ef4f
font_01_sfnt_off00006098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6098 18924 bytes
SHA-256: 11203c36e668451e19a240d15881d1677c243aeadc4d16e0b96cc108bebd7a91

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