Malicious PDF — malware analysis report

Static analysis result for SHA-256 1824dee2f32cd50d…

MALICIOUS

PDF

46.0 KB Created: 2021-06-03 16:14:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6788fc39bb4fa9f3d553d23364e24139 SHA-1: 9ee19671865b306850bc7064d181bb90a300e6a4 SHA-256: 1824dee2f32cd50dd1adbb50614872ccb78ec7409b7524fedaa950b6f2b58839
200 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'free generator / game hack' which redirects to a malicious URL. The document displays a fake CAPTCHA or human verification prompt to trick the user into interacting with the malicious link. The primary malicious URL identified is https://netcdn.online/app/431946152/how-do-you-get-roblox-for-free-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristics suggest potential for embedded JavaScript or exploitation of PDF vulnerabilities to execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/431946152/how-do-you-get-roblox-for-free-game-hack In PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-spin-and-coin-blogspot-com_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-400-spins-coins-master_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/xray-hack_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/pokemon-go-free-ultra-balls_GM1094591345.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-hack-tool-download_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/level-coin_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/hacked-client-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-hack-golden-card-in-coin-master_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_004_off000054a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54A7 26244 bytes
SHA-256: 9d0f13ff3eab00d24633ccc882cae254afb1c3a468e6ad3a5f19b47f064f1792
font_01_sfnt_off00008ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF6 18688 bytes
SHA-256: c319980467b8bcea808cf7446b1cb0422dd1c28f9b99e7a79dce679e259df094

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