Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b847bed2b8aff11…

MALICIOUS

PDF

48.2 KB Created: 2021-06-11 01:02:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c29abfa82c711ba16c5e29a957cc26cd SHA-1: d260f007624a0fbadbb3e023431fa445a57d3969 SHA-256: 5b847bed2b8aff11e62e9ae85f1150f54bd10bb198e05ef9f752a6ca5b6ebb14
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and potentially malicious infrastructure, disguised as 'game hacks' or 'generators'. The heuristic firings strongly indicate a malicious redirector designed to lure users to scam or malware download sites. Although no scripts were explicitly extracted, the nature of the links and the lure suggest an attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/anyway-to-get-robux-for-free-game-hack In PDF document text
    • http://hardbit.cn/images/roblox-hack-server_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/how-to-hack-in-roblox-jailbreak-speed_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/free-coin-master-stuff_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/robux-survey_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/minecraft-bedrock-edition-hacks_GM479516143.pdfIn PDF document text
    • http://hardbit.cn/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/how-to-win-attack-madness-in-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://hardbit.cn/images/roblox-hack-client_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-hack-software-download_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50C1 25508 bytes
SHA-256: cc446f45b86cdd2d4f211c499a8fc7aa45aadb0f3f4ad15f08206142c81bc96b
font_01_sfnt_off00008bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BCE 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00009876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9876 18688 bytes
SHA-256: 084c92d83b62afd1438c3a1bf5180cad4469862d4f925aa8c66dd4232e02f1dd

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