Malicious PDF — malware analysis report

Static analysis result for SHA-256 af271d66810c8d8d…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 07:30:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c0cf05a066ee03dc3a9c5a4ea09c1c12 SHA-1: a1a8746ff0592473961dbd18d7d05774a66e5243 SHA-256: af271d66810c8d8d150ea51be0199dfb5bedcf5ad8a189e4b18dab955891499d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on a 'free generator' or 'game hack' website. The primary redirector URL, http://netcdn.tw/app/431946152/robux-hacking-website-no-verification-game-hack, is flagged as malicious. The document body and embedded URLs reinforce this lure, aiming to drive traffic to potentially malicious or scam-related content. No scripts were extracted from this sample.

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.tw/app/431946152/robux-hacking-website-no-verification-game-hack In PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-com-real_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-shirt-template-free_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/1-minute-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-make-a-hacked-private-server-on-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-fe-music-gui-hack_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/is-coin-master-free_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-protosmasher-free_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-piano-keyboard-cheat_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/mcpe-download_GM479516143.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-rare-cards-hack_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-use-brutus-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/robux-link_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_off00003010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3010 22432 bytes
SHA-256: 954cf24aabcdf7bd451bf150d78a820e5e0a07387d63e51a01bd1ced3c3971f9
font_01_sfnt_off000061dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61DC 19092 bytes
SHA-256: 1c8560cdfabee50e6f39ee3bddb244eb1e4bc3b2b303c0444bf0aa57d9535a95

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