Malicious PDF — malware analysis report

Static analysis result for SHA-256 5935a5fa150bb4e8…

MALICIOUS

PDF

36.7 KB Created: 2021-07-06 08:51:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f132b318cc7a87f7fa8f041bb4cd6004 SHA-1: 1253691867e32ef5cf2b0c1fedcb509bdff857b6 SHA-256: 5935a5fa150bb4e818af9d55cc4f71139954ec13a676751bbfaab71bc812af2c
200 Risk Score

Malware Insights

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

This PDF document is designed as a lure, presenting itself as a generator or hack for popular games. It contains multiple links to redirector infrastructure, including http://netcdn.tw/app/406889139/mcpe-master-unlimited-coins-free-download-game-hack, which is flagged as malicious. The document body and embedded URLs suggest a social engineering tactic to trick users into visiting potentially harmful sites, likely to download further malware or engage in credential harvesting. The presence of PDF-specific heuristics and embedded URLs points towards exploitation of PDF vulnerabilities or social engineering via document 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/mcpe-master-unlimited-coins-free-download-game-hack In PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-project-jojo-free-vip_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-free-robux-no-inspect-no-pastebin_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/coin-master-hack-1021_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/robux-hack-no-human-verification-no-download_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/bluebird-free-roblox-youtube_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-hack-counter-blox-2021_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-999billion-robux_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-roblox-toys_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-obby-for-free-robux_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-hack-new-dtfb-test_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/howt-to-hack-roblox-with-cmd_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-send-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-free-admin-on-any-roblox-game_GM431946152.pdfIn macro / runtime command snippet
    • http://digilibfisip.unla.ac.id/repository/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repositorIn macro / runtime command snippet
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003458.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3458 23744 bytes
SHA-256: 63a2cbc44a492cbb53ef9ea45f3c754cf1d06576777893d149cfd72e106a42ca
font_01_sfnt_off00006a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A68 19200 bytes
SHA-256: 55453b7c26a1b829ac84192da20e0347e0ddd989198a17e180efad0d48ee69d9

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