Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b52126a80d71dc…

MALICIOUS

PDF

44.0 KB Created: 2021-06-03 05:04:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5fb58bc1ef43caa14085547b07fb0b6e SHA-1: 1eacf1d34e002c729bbe23ae64db9e80cd85753a SHA-256: 09b52126a80d71dcce6ddf34d8f64de5a19c4f8aaf52b282d449e6852bfdad66
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as lures for game hacks and free in-game currency. The ML classifier also flagged this PDF with high confidence. The embedded URLs suggest a phishing or scam attempt, likely leading to further malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/431946152/roblox-free-models-game-hack In PDF document text
    • http://razredna-nastava.net/files/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/minecraft-apk-android-free_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/coinmaster-spins_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/client-minecraft_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-co_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-800-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-master_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-robux-without-any-verification_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_004_off000050c3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50C3 25096 bytes
SHA-256: ee1193fb8388e1197e62a90a83622af2287b282b498bb37c2bb0eff8adf4ba6e
font_01_sfnt_off00008970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8970 18316 bytes
SHA-256: 1d6d519228266e593a5dbdb6f77319029d78082529b60fc9639d7bb84414d931

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