Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f9397943198fd3…

MALICIOUS

PDF

35.1 KB Created: 2021-07-03 19:07:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 18bcc5b53f99dbffba42ecfef1b137cb SHA-1: fee3e1977a9d209bdee788ffd5a671fd8259dcfc SHA-256: b8f9397943198fd37fb6fb14ce78e1d94b1df44a30b607602a95e486afb11157
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and lures users with promises of free game currency or hacks. The document body and embedded links suggest a social engineering tactic to trick users into visiting potentially harmful websites. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/406889139/coin-master-free-spins-app-game-hack In PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/how-to-get-free-robux-on-roblox-on-tablet_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/minecraft-free-install_GM479516143.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/boku-no-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-roblox-animations_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/how-to-hack-roblox-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/alone-how-to-get-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/denisdaily-robux-hack_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-password-generator-free-download_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/ezekiel-how-to-change-your-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-how-to-get-free-obc-lifetime-2021_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/game-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/creator-give-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/100-robux_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-noclip-hacks_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/coin-master-heaven-free-spins-link-2021_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_002_off00003306.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3306 23176 bytes
SHA-256: b808e8686caff4ffa1e81b7e3adf324af14d9282c63d21bee3dffcdef024aa99
font_01_sfnt_off000066c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66C8 18176 bytes
SHA-256: 4f2c7f50c50d911764fc5880fa9a71240a98bde4d6a03cad0f4e23413d6df79f

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