Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21effdabf6e6553…

MALICIOUS

PDF

41.8 KB Created: 2021-05-17 18:30:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 75a2c5df126a1ca4fc1143969c411b81 SHA-1: 4c01d999935cb2123e2a233e2552d1366f042831 SHA-256: d21effdabf6e655349b06ab67ac58669079a11a76e185a52d027d87278d3de97
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, including one identified as a malicious redirector for 'free game hacks'. The ML classifier also flagged this PDF as malicious. The presence of these links suggests the document is designed to trick users into visiting potentially harmful websites, likely for malware distribution or phishing.

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/479516143/minecraft-java-free-game-hack In PDF document text
    • http://sbm-nn.ru/images/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-daily-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-pe-apk_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-hack-coins-in-archery-master-3d_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-promo-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/reddit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b52.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B52 24568 bytes
SHA-256: 00195bf449f5062a731e3adf6973800fb420cbf94b7a4fa4106ee2b335384dad
font_01_sfnt_off0000825c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x825C 17848 bytes
SHA-256: c651dee67b00b36100d0c208f30a7974f38e9c4fefacd489da3c8fda34869f62

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