Malicious PDF — malware analysis report

Static analysis result for SHA-256 4838b9d01e57572e…

MALICIOUS

PDF

47.1 KB Created: 2021-06-03 05:04:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5ccb54673979261277fa935d3b33cedb SHA-1: 79529d3b6f4e3e0228278fa000491d2b1d771d4c SHA-256: 4838b9d01e57572e2122a62dce62021b61e7bae9d3206d69d09e38f276b959aa
200 Risk Score

Malware Insights

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

The PDF document presents a fake CAPTCHA or human verification prompt to lure the user into clicking a link. This link, identified as a malicious redirector, leads to a website offering game hacks. The document's primary purpose appears to be directing users to malicious infrastructure, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/406889139/free-coins--spins-coin-master-game-hack In PDF document text
    • http://library.umla.ac.id/repository/get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/pubg-uc-xyz_GM1330123889.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-roblox-adopt-me-pets_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-roblox-accounts-dantdm_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-do-i-get-minecraft-for-free_GM479516143.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_off000052fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52FC 25368 bytes
SHA-256: d052715e55f784a56d77a7ac53ad9b4537d126ff8344389b0262d0e92171d510
font_01_sfnt_off00008cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD5 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9688 17884 bytes
SHA-256: 87895e974442f188ddda899e84169346f160d3f79a40513770ad9f12d57579e0

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