Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85f6d66f2a66cec…

MALICIOUS

PDF

32.9 KB Created: 2021-06-27 06:14:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d134e53bb06083f15d7f33022c8fd862 SHA-1: 1c43cf00117315587f1713df9b8a566491c9b949 SHA-256: b85f6d66f2a66cec174b347f04f83373f8559a74a750f14dc2e4c2e03f6464f4
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, disguised as 'game hacks' and 'generators' for popular games. The primary lure URL is http://netcdn.co/app/431946152/how-to-earn-robux-for-free-2021-game-hack, which is designed to trick users into downloading potentially malicious content or providing personal information. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.co/app/431946152/how-to-earn-robux-for-free-2021-game-hack In PDF document text
    • http://fotoflas.gr/images/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://fotoflas.gr/images/coin-master-apk-hack-mod-download_GM406889139.pdfIn PDF document text
    • http://fotoflas.gr/images/free-robux-for-joining-groups_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/free-robux-no-genertor_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/free-robux-that-only-needs-your-password-totally_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://fotoflas.gr/images/hex-number-gives-free-robux_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/roblox-scr-hack_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/free-roblox-cad-code_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/free-admin-roblox-commands_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://fotoflas.gr/images/roblox-account-taker_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/roblox-money-generator-free-download_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/dantdm-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/hacks-para-roblox-2021-may-cualquier-juego_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/roblox-money-giver-hack_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/free-button-roblox-script_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/rthro-packages-free-roblox_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_off000029d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29D1 22324 bytes
SHA-256: bb623cc5a1924d2b31841908c134aaac1d15e363003360c4b6c063148f3fc4ff
font_01_sfnt_off00005b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B22 19284 bytes
SHA-256: b399ae733d7917559aeb38653f56690fc8d0842846df9d5376906f0eed96920f

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