Malicious PDF — malware analysis report

Static analysis result for SHA-256 c639e3c410b151a3…

MALICIOUS

PDF

45.7 KB Created: 2021-05-15 23:03:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: be448a4ee20af59f3fc9065b14b48ce4 SHA-1: b8ff25780bc1c7be6b3f1d9a98f6b59fccea0ad1 SHA-256: c639e3c410b151a3ef70c4843e7d1f5e2f8b8539f093f873b43c4d4e9f7a6797
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to a redirector URL, masquerading as a "free generator / game hack". The primary malicious link is https://netcdn.xyz/app/406889139/free-foxy-food-coin-master-game-hack, which is part of a known malicious redirector infrastructure. The document body and embedded URLs suggest a lure for game-related cheats or hacks, likely leading to further malware downloads or phishing pages. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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.xyz/app/406889139/free-foxy-food-coin-master-game-hack In PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-cards-free-cards_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/www-roblox-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/strucid-aimbot_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/how-to-play-minecraft-online-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004aea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AEA 25064 bytes
SHA-256: b4b682b5d1290add285008efb2015dc51cd985476fabe835e056428ad60ea4b9
font_01_sfnt_off00008414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8414 3380 bytes
SHA-256: 1dd933c112880b232546f3aab6a17784a8f412d39fd551cc6eb31c5a04c3ce57
font_02_sfnt_off00008ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FFD 18272 bytes
SHA-256: 36b3b1238517c33c5efb2f434edc6a86fb2c27e62e92d06e943c1c1826ebc1e6

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