Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9b2c61ce8da84d…

MALICIOUS

PDF

43.1 KB Created: 2021-05-12 13:36:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0f95906390811a5ed85de78ee635879e SHA-1: 1340d12fc10db781bce327af0e748b7c48001258 SHA-256: 6a9b2c61ce8da84d8eaa8d003a07b44319a44c7c976dbc8d182f715e91bdd3c0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as "game hacks" and "free generators". The embedded URLs, such as https://netcdn.xyz/app/406889139/coin-master-hack-review-game-hack, are designed to lead users to potentially harmful content. The presence of a visual download button further supports the lure tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a malicious intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-hack-review-game-hack In PDF document text
    • http://pietroubaldi.org.br/images/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/coin-master-gift-hack_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/how-many-levels-does-coin-master-have_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/roblox-accounts-for-sale-free_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/roblox-fun-com-robux_GM431946152.pdfIn PDF document text
    • http://pietroubaldi.org.br/images/free-spins-and-coins-coin-master_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_003_off00004a68.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A68 29788 bytes
SHA-256: 76360e3e48766c855bc0c30fd83d5cc8159ee66a3eb89e3b39264135ebefb2f6
font_01_sfnt_off000086b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86B4 17996 bytes
SHA-256: bfe601b020b171f100e70e38fab7406fb887819b27a361e00f5b71bc8f64446b

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