Malicious PDF — malware analysis report

Static analysis result for SHA-256 13635f1835fea8e0…

MALICIOUS

PDF

34.0 KB Created: 2021-07-04 10:46:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d976e9acba3909020445ef19682ccd46 SHA-1: 223ed04b6a091b6b9b54d603249d8fe257be3b19 SHA-256: 13635f1835fea8e04231e29ff930c8ddb161f8f1d3f6ff074a286b38963f28a2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. These links lead to further PDFs hosted on domains like astdubai.co, suggesting a chain of malicious redirects designed to deliver unwanted content or malware. The ML classifier also strongly indicated maliciousness.

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/406889139/25-free-spins-coin-master-game-hack In PDF document text
    • http://astdubai.co/userfiles/files/coin-master-hack-2021-apk-download_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-hack-pc-download_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-free-builders-club-in-roblox-ipad_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/get-free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/cm-free-spins_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/www-coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-simple-easy_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-roblox-accounts-2021-that-work_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-a-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-free-skins-in-roblox_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-heaven-free-spins-today_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_off00002e6a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E6A 22820 bytes
SHA-256: 415993f0c29e5f80a39fc9583c075d10a5bef8e03b5990dee9a6db755010e14b
font_01_sfnt_off0000618c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x618C 18432 bytes
SHA-256: ec79058dc3660cd38899abd0af6a529c62159de1466b2a8febb865623eb50a1d

Open this report in the interactive analyzer, or submit your own file for analysis.