Malicious PDF — malware analysis report

Static analysis result for SHA-256 80fb8a0d58cbb79f…

MALICIOUS

PDF

43.1 KB Created: 2021-05-11 16:32:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5eadc8983ae12bc52995b674b96458eb SHA-1: 79090d63d59cf7d58278611051c67ea5596adfe5 SHA-256: 80fb8a0d58cbb79fb091666df6d94770c762b58b8e3425f4ee7e9737880c2c26
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one identified as a malicious redirector pointing to 'free-robux-sites-2021-game-hack'. The document body and heuristics suggest a lure for game-related cheats or downloads, likely intended to trick users into downloading further malware. No scripts were extracted, but the presence of embedded URLs and the nature of the lure indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/free-robux-sites-2021-game-hack In PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-daily-spin-link-app_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-spins-for-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/abd-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-ids-for-free-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/minecraft-free-school_GM479516143.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_003_off0000499c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x499C 25676 bytes
SHA-256: d6fdf0987945d2a2dd39b33d70e0eccb0e424a004ecfbfd32a6038696500ae10
font_01_sfnt_off00008510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8510 18640 bytes
SHA-256: b8260c20a5a482fa631977c1895ef4fabb59c0a91f65cf95745fb521070d0a95

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