Malicious PDF — malware analysis report

Static analysis result for SHA-256 779f8745a359480a…

MALICIOUS

PDF

48.4 KB Created: 2021-06-10 22:52:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2fbb5da579282a932d07626f3a83afc0 SHA-1: 7eeba3af6046a7d1305dc19cd73ced2ba80e828e SHA-256: 779f8745a359480a3d7b44ff8ce1372ce1112e2ed2ed38613482741b393042cd
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document displays a fake CAPTCHA lure to trick users into clicking a malicious link. This link redirects to a website offering game hacks, which is a common social engineering tactic. The document contains multiple embedded URLs pointing to similar scam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/roblox-hack-tokyo-ghoul-game-hack In PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-spin-and-coin-link-app_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-ban_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/why-am-i-a-cheater-in-roblox-parkour_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-hack-mod-apk-35-8_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-roblox-script-hub_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-airport-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-spins-and-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e0e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E0E 28748 bytes
SHA-256: d2f8bdb7a0b71397d960ca89d9337acd97a577138febc6137e1f6a52301a6dbe
font_01_sfnt_off00008f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F70 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off0000991f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x991F 18668 bytes
SHA-256: 7d41b86e9bb43d4b80bd8c5907f832461d8a4831c49fb0b45a997ce9565579c0

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