Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3c8a6669326e05…

MALICIOUS

PDF

43.8 KB Created: 2021-06-03 07:07:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5e2c60767585e2a8345db0faf1285a89 SHA-1: 91544fca4f6833a7e4e70d2e26546fe2db483ff8 SHA-256: 7f3c8a6669326e05a8d79333952e9d0270fb853401f8bd8288cf0a145d015a70
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a lure related to game hacks and free generators, directing users to a known malicious redirector. The embedded URLs and the document's content strongly suggest a phishing or scam attempt designed to trick users into visiting malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/free-spin-and-coin-game-hack In PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/minecraft-mod-menu-apk_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/inappropriate-roblox_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-hack-club_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/do-robux-generators-work_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/moonactive-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-tiktok-accounts-and-passwords_GM835599320.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/gamehunters-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/earn-robux_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
stream_004_off000051d8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51D8 25060 bytes
SHA-256: 90307c7e39e4834509fece9709b8f1c8c1f471cee0a799dcf204d1563024fc04
font_01_sfnt_off00008a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A35 17728 bytes
SHA-256: 14aa911ad6e5c7047adc26f09c02dee025e58de6207e09974a07acc23cb9456b

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