Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0640870c930d17…

MALICIOUS

PDF

35.0 KB Created: 2021-06-19 11:32:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 87ed3639a17366c880a582657f7b9d91 SHA-1: 606326fa16386506fc6982b37341a942b87ad692 SHA-256: cd0640870c930d17b6aca72248906ee2c9ec416adbe44f2e7687c088b23deabc
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'game hacks' and 'free generators' to lure users. The primary URL, http://netcdn.co/app/431946152/como-hackear-la-cuenta-de-alguien-en-roblox-game-hack, is a clear indicator of a social engineering attack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to exploit user interest in gaming cheats to deliver a malicious payload or redirect to a phishing site.

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.co/app/431946152/como-hackear-la-cuenta-de-alguien-en-roblox-game-hack In PDF document text
    • https://learnwmf.org/image/data/files/pokemon-go-free-90-iv_GM1094591345.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/earn-robux-sites_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/cool-free-roblox-items_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/pig-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/omplete-surveys-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-free-spins-link-download_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
font_00_sfnt_off00002fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA4 22908 bytes
SHA-256: b79d57e3c2cdf55576392ef468e4216cf8971d24043ef61375eaf42c878ed008
font_01_sfnt_off000062cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62CD 19448 bytes
SHA-256: 6bcaf44dc74989d4c26321ba6b16e07d634dd863c2b7fd47550ebd6556c348eb

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