Malicious PDF — malware analysis report

Static analysis result for SHA-256 4439637cf0efeb96…

MALICIOUS

PDF

46.2 KB Created: 2021-06-03 12:00:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c2790b9b3f799bde69c4e0fab1da8de5 SHA-1: 84f597e36c2626764678eaa41899886c584a6fcb SHA-256: 4439637cf0efeb964ec32f613e8d98426394c1b4599fe7ab821fe128f3ef22e3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains multiple links that redirect to known malicious infrastructure, specifically promoting 'game hacks' and 'free spins'. The heuristic firings confirm these links are designed as lures for malicious redirects. While no scripts were extracted, the embedded links and the nature of the lures strongly suggest an attempt to direct the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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.online/app/406889139/coin-master-hack-app-ios-game-hack In PDF document text
    • https://www.insol-europe.org/uploads/files/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-hack-app-ios_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/robloxhacks_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/microsoft-bing-robux_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/update-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/202100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-time-hack_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-human-verification_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_004_off000050eb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50EB 24288 bytes
SHA-256: 599402a5beab3804b6958694c64d9256734fa9e56ccfc72030bb33a667514e72
font_01_sfnt_off000088a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88A9 2920 bytes
SHA-256: 601c50867a41b9362538ff18e5f9479a0f9badf698aaf1eb7e88469c11719db7
font_02_sfnt_off000092c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92C3 17892 bytes
SHA-256: 842ebafe75553617aa3406336693b508b1df3cd42ae030bb56c7cc7ab7429b4f

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