Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5c99ef8ad87752…

MALICIOUS

PDF

42.7 KB Created: 2021-05-11 13:04:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c0d991246566ec2bbb8715861400838e SHA-1: 7f4f8d31091f07b0439ce38d3d71ce6a63580e25 SHA-256: 7d5c99ef8ad877528dcd1e0daf288efdb5252ca064eaeec602d3b2a25116db3b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites offering game hacks and free in-game currency, such as 'Coin Master Card Collection Hack Apk'. One of these links, https://netcdn.xyz/app/406889139/coin-master-card-collection-hack-apk-game-hack, is identified as a malicious redirector. The document body and heuristics indicate a lure for users to click these links, likely leading to malware downloads or phishing pages. No scripts were extracted, but the presence of embedded URLs and the malicious redirector strongly suggest a malicious intent.

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-card-collection-hack-apk-game-hack In PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-minecraft-mods-for-pc_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux-master_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-50-spin-link_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-hacks-no-surveys_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/minecraft-112-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-hack-and-get-free-robux_GM431946152.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_off00004d68.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D68 24384 bytes
SHA-256: f78daac62affc3367574777c35a4ba7f28a24c198444133267c7359f053cee07
font_01_sfnt_off0000850c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x850C 18140 bytes
SHA-256: 68c29d815848bb603bcc9c69777aac60e323e9398a8fda93459a550b8c2ca937