Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b57cddc3c1d99a4…

MALICIOUS

PDF

47.9 KB Created: 2021-06-08 22:58:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9621848a06897991c0b0d906e71428ce SHA-1: 3198e0bfc9b1d6a3c1884ddd86bd191fec501264 SHA-256: 1b57cddc3c1d99a4a016d5028d9d026bd6afdc8ab281aa21e8db3e9d29bdea7d
200 Risk Score

Malware Insights

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

This PDF document employs a lure of free game hacks and generators to trick users into clicking malicious links. The links redirect to known malicious infrastructure and present fake CAPTCHA pages, likely to facilitate further exploitation or credential harvesting. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or social engineering attack.

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/how-to-get-a-free-pet-on-roblox-adopt-me-game-hack In PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/coin-master-free-spins-link-without-human-verification_GM406889139.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/free-tiktok-comments_GM835599320.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/roblox-free-play_GM431946152.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today-blog_GM406889139.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/freer-pro-tiktok_GM835599320.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/earn-robux-today_GM431946152.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/coin-master-link-today_GM406889139.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/free-roblox-red-pants_GM431946152.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/roblox-login-free-no-download_GM431946152.pdfIn PDF document text
    • https://jormix.co.id/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today-2021_GM406889139.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
font_00_sfnt_off0000501a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x501A 24688 bytes
SHA-256: f771043552f111acfb345537e1316c7ffcbc134d34e6ac69697cedfc6addd007
font_01_sfnt_off0000891e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x891E 4008 bytes
SHA-256: 515da38a799acdefd039af3a0dfb6ec4815b572058c9bd492ec5a77cd7658593
font_02_sfnt_off000096aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96AA 18916 bytes
SHA-256: 49bfd260ab9c3661001bc9fe1d507d2f2df80e2a19cb47180bf159db80781a77

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