Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3f6529a840ebf8…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 22:30:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6c2bf39d9262cf2f43562ab4c3142705 SHA-1: a1a9202de366b74b8bc0b6f8ca587b27cf08a849 SHA-256: de3f6529a840ebf8203243fd960d81efe946a53bb450a27653d00f12d1c3178c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to a known malicious redirector, specifically advertising a 'Coin Master Hack'. The document body confirms this lure, directing users to 'http://netcdn.tw/app/406889139/coin-master-hack-with-lucky-patcher-game-hack'. This indicates a social engineering attack aimed at tricking users into visiting a malicious site, likely for further malware delivery or credential harvesting.

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/406889139/coin-master-hack-with-lucky-patcher-game-hack In PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/moon-active-games_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-free-download-pc_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/funny-free-roblox-shirts_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/rbx-gg-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/best-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-app-by-roblox_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-800-robux_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/downloadable-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/roblox-hack-tix-and-robux-generator_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-get-free-robux-by-playing-games_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_off00003169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3169 22924 bytes
SHA-256: d0b807932bcc09ae091de712277b8d9539bd92e027ae5bb2bfa2af289aa73290
font_01_sfnt_off000064fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64FE 18844 bytes
SHA-256: 181355d1b7e66c1d20dcc1443123f7c6903d0db3f2ff4c5ece234af5b51ade1d

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