Malicious PDF — malware analysis report

Static analysis result for SHA-256 1962651d60e29aaf…

MALICIOUS

PDF

42.3 KB Created: 2021-05-13 23:04:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9038b400943ff91e89aa5e93e6a77b55 SHA-1: 3342a3daaa7be962c3b970decfe952e6fd40c24e SHA-256: 1962651d60e29aaf946feee6693bb054a18aa5bc5d8d7a6956273d0b8938ec8f
200 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'free generator / game hack' lure. The document body and embedded links suggest a social engineering tactic to trick users into visiting a malicious website, likely to download further malware or engage in credential harvesting. The fake CAPTCHA heuristic further supports this social engineering pretext.

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/i-robux-game-hack In PDF document text
    • http://mbbs.hr/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-working_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/hack-client_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-quiz_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/robux-website_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-minecraft-generator_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/robux-free-c_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/wurst-18_GM479516143.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_off0000470c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x470C 26772 bytes
SHA-256: ec2616503158a1b76271f6904ed8247674b8650ecc8b855316bb0ccc38761e65
font_01_sfnt_off00008443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8443 17852 bytes
SHA-256: 60f9a9423da9e572e1984add889302644738968a990936a78873c1198bc7dc3d

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