Malicious PDF — malware analysis report

Static analysis result for SHA-256 834b044250ddac75…

MALICIOUS

PDF

36.8 KB Created: 2021-07-04 12:05:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5ce2061d145ddf54cc6773e7d81088e5 SHA-1: f145421b61dbadda697055e7b471fdc0f905dd06 SHA-256: 834b044250ddac755f34377b1f64872271c8b3fbe44ec0edcf521bca640c245c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free generator / game hack' lures. The primary malicious URL identified is http://netcdn.tw/app/406889139/free-spins-on-coin-master-links-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a workflow designed to lead the user to download further malicious content or exploit kits.

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/406889139/free-spins-on-coin-master-links-2021-game-hack In PDF document text
    • https://bwsrubber.com/image/data/files/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/free-private-server-roblox_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/hightlighter-player-roblox-cheat_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/how-to-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/get-free-roblox_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/how-i-get-bloxburg-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/free-dantdm-hair-roblox_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/talk-as-someone-roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/roblox-sans-shirt-free_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/cheats-roblox-high-school_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/coin-master-pro-hack_GM406889139.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/roblox-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/daily-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/vortexx-roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/roblox-free-ninja-mask_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/roblox-hack-account-2021-free_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/coin-master-gameplay_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_002_off000036cb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36CB 23364 bytes
SHA-256: 8034d5a311e26ef4e7fd35c928f31d9a51204f563fa2b9c3717dc22366a8e8aa
font_01_sfnt_off00006bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBD 18748 bytes
SHA-256: 172d7edc7b704133c11c250e037ef23dd19261bcf2198edae7c01912c23da7d1

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