Malicious PDF — malware analysis report

Static analysis result for SHA-256 d054ee90fe051d9d…

MALICIOUS

PDF

35.1 KB Created: 2021-06-22 09:22:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0a8042d691a0bc6ca475d305d291fc4b SHA-1: 099fe2168d9dd3162ad3d5e3d8260dccf134f9c0 SHA-256: d054ee90fe051d9dbb8451033c5cbfa5d17df1ba71d0f82185f31db17f207232
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external sites, many of which are part of a link farm designed to lure users with promises of game hacks and free currency. The primary redirector URL, http://netcdn.co/app/431946152/roblox-events-2021-robux-free-game-hack, is flagged as malicious. While no scripts were explicitly extracted, the structure and heuristics indicate a malicious redirection workflow, likely intended to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.co/app/431946152/roblox-events-2021-robux-free-game-hack In PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-counter-blox-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-phone-number-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/minecraft-that-you-can-play-for-free_GM479516143.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/archery-master-3d-unlimited-coins-hack_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-hack-apk-35-8_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-hack-in-roblox-games_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/hacker-png-roblox_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-block-someone-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/i-robux_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-account-taker_GM431946152.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
font_00_sfnt_off00003045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3045 22600 bytes
SHA-256: 1ed5bcf946f94e1a62f86b8bd66e39712a5e72c0b6d242332b5c5d6db39d2721
font_01_sfnt_off000062d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D6 19412 bytes
SHA-256: 294d1c03d6610ae9c613a7653369bb207de83ea7fbdb5cbf1818ced4342328bd

Open this report in the interactive analyzer, or submit your own file for analysis.