Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bd87c170462190…

MALICIOUS

PDF

41.3 KB Created: 2021-05-11 06:03:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fef5eb2544d6afbdf4e602a07624a718 SHA-1: 07fcca163dbfad5e634d615133c1f90aedc5555e SHA-256: 91bd87c17046219085de65d3031ff8cdd77102749bc1b6f17d8043877a5ff179
200 Risk Score

Malware Insights

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

The PDF document contains a malicious link disguised as a game hack generator, which is further supported by a fake CAPTCHA lure to trick the user into interacting with the content. The embedded URL likely leads to a second-stage download or exploit. No scripts were extracted, but the PDF structure and heuristics indicate a malicious redirector and lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/how-to-hack-roblox-to-get-free-robux-game-hack In PDF document text
    • http://j-cook.pro/images/good-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://j-cook.pro/images/coin-master-apk-mod-hack-download_GM406889139.pdfIn PDF document text
    • http://j-cook.pro/images/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://j-cook.pro/images/coin-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://j-cook.pro/images/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://j-cook.pro/images/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://j-cook.pro/images/como-descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • http://j-cook.pro/images/daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://j-cook.pro/images/game-hunters-coin-master_GM406889139.pdfIn PDF document text
    • http://j-cook.pro/images/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • http://j-cook.pro/images/roblox-avatar-maker-free_GM431946152.pdfIn PDF document text
    • http://j-cook.pro/images/do-robux-generators-work_GM431946152.pdfIn PDF document text
    • http://j-cook.pro/images/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://j-cook.pro/images/coin-master-spin-hack-app_GM406889139.pdfIn PDF document text
    • http://j-cook.pro/images/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://j-cook.pro/images/how-many-villages-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://j-cook.pro/images/easy-robux-generator_GM431946152.pdfIn PDF document text
    • http://j-cook.pro/images/free-robux-app_GM431946152.pdfIn PDF document text
    • http://j-cook.pro/images/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://j-cook.pro/images/haktuts-coin-master-free-spin-link_GM406889139.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_003_off000046b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46B8 24072 bytes
SHA-256: 9559dbbc09b36531e96fdd3d987136a08021f86eaf9fc85710f4aa17cdb46bfb
font_01_sfnt_off00007d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D8B 18756 bytes
SHA-256: a768fd9037f2962d7d468f6b0310abba3890de72b41426d235b5de2790bab1ac

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