Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b85b79d2a06d1d9…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 21:37:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3c6e3d571ad121ebda9e2ecd4196be10 SHA-1: 774cb9e045a48e8918d9d29ac9e8bdd0af47925f SHA-256: 4b85b79d2a06d1d9b957b1d89b4b21f2d370585ebc3da11b5ddb3b1cc3e77c21
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically targeting users interested in game hacks and free in-game currency. The ML classifier strongly indicated maliciousness, and the presence of numerous redirector links confirms a lure-based attack pattern. No scripts were extracted, but the primary attack vector is the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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.tw/app/431946152/roblox-fun-com-free-robux-game-hack In PDF document text
    • http://gts.edu.gh/library/repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-unicorn-code-roblox-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-race-track-free_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/black-clover-online-roblox-hack_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/minecraft-windows-10-key-free_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/hack-roblox-accounts-easy_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-hacks-kostenlos_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/hack-coin-master-nyc_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-dll-hack-file_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-simulator-hacks_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-buy-robux-for-free_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_off0000300e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x300E 22268 bytes
SHA-256: dd0da153dbaf4de6b075fcd95980741d27d7341bdccbfb48bab5fa043f4f6a8c
font_01_sfnt_off00006142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6142 19052 bytes
SHA-256: 3b2abcc7aa29ca008ea5e4cc3b72e95e65b47650fe7c616c7ae72cc37841b392

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