Malicious PDF — malware analysis report

Static analysis result for SHA-256 28da3f51eb2559df…

MALICIOUS

PDF

42.8 KB Created: 2021-05-13 17:43:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8cc935eeb6cd555bcd92c33a2f75ad02 SHA-1: 8df84c5068aed54668eb4db8d733c32f719f2a2c SHA-256: 28da3f51eb2559dfad787f70ffa6d1bc4c1b2d9197fd37772e1159e21185388f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting game hacks and generators. The primary lure is a link to 'free unlimited Coin Master spins', which is a common social engineering tactic to trick users into visiting potentially harmful sites. The ML classifier also strongly indicated maliciousness.

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/free-unlimited-coin-master-400-spin-link-game-hack In PDF document text
    • http://cmme.it/images/minecraft-items_GM479516143.pdfIn PDF document text
    • http://cmme.it/images/coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://cmme.it/images/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://cmme.it/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cmme.it/images/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://cmme.it/images/www-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://cmme.it/images/coin-master-spin-hack-link_GM406889139.pdfIn PDF document text
    • http://cmme.it/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://cmme.it/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://cmme.it/images/minecraft-noob-vs-pro-vs-hacker_GM479516143.pdfIn PDF document text
    • http://cmme.it/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://cmme.it/images/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://cmme.it/images/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://cmme.it/images/coin-master-hack-without-human-verification-india_GM406889139.pdfIn PDF document text
    • http://cmme.it/images/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • http://cmme.it/images/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://cmme.it/images/coin-master-hack-for-android_GM406889139.pdfIn PDF document text
    • http://cmme.it/images/coin-master-spins-gratis_GM406889139.pdfIn PDF document text
    • http://cmme.it/images/minecraft-bedrock-edition-hacks_GM479516143.pdfIn PDF document text
    • http://cmme.it/images/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • https://coinmasterspinandcoin.comIn 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_off000049c0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49C0 25248 bytes
SHA-256: 5f0c927e080204c957c512e9570b0328f0633134cec5486bef1cdb8c28580814
font_01_sfnt_off00008314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8314 18984 bytes
SHA-256: 2e007fc84fc568f88879723ba48bdd06936c094fc864f4c5a558b00572ac3444

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