Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b50f77a7442e3c6…

MALICIOUS

PDF

45.5 KB Created: 2021-05-16 04:03:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 21f6f1480825aea0a38c13a171b00083 SHA-1: 2159d27a6e0d83170300e1d0febf47ff932bef34 SHA-256: 5b50f77a7442e3c6d29f84559da9b5d8edf4c4ff00b26b9ecaceb83bef7bf275
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically promoting "free generator / game hack" lures. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of malicious redirector links and the lure content suggest an attempt to drive users to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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-spins-on-coin-master-without-human-verification-game-hack In PDF document text
    • http://galletta.com/images/coin-master-tricks_GM406889139.pdfIn PDF document text
    • http://galletta.com/images/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://galletta.com/images/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://galletta.com/images/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://galletta.com/images/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://galletta.com/images/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://galletta.com/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://galletta.com/images/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://galletta.com/images/gold-card-coin-master-free_GM406889139.pdfIn PDF document text
    • http://galletta.com/images/como-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://galletta.com/images/free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://galletta.com/images/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://galletta.com/images/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://galletta.com/images/free-spin-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://galletta.com/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://galletta.com/images/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://galletta.com/images/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://galletta.com/images/coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://galletta.com/images/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://galletta.com/images/hacks-roblox_GM431946152.pdfIn PDF document text
    • https://coinmasterspinandcoin.comIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004823.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4823 25912 bytes
SHA-256: 70ad53e00a39b760a84f53102ea47f3b2e634ac46f6035b5ca2d76c2038219af
font_01_sfnt_off0000841f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x841F 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E09 18784 bytes
SHA-256: 960842b6fe33ab0647d2f84e57a2bd0982928fead2374cfcf5cb9148229d7a4f

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