Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ec2f77708c9b61…

MALICIOUS

PDF

44.3 KB Created: 2021-06-09 01:15:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3c2fb7d5150f4c7632b0ec29a5fa59f5 SHA-1: 2f9143a4051f5040346705971592127836179bca SHA-256: 57ec2f77708c9b61bc4c65f6fd345d19d934428d87dc24ad250b7bb4207de998
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 generators for popular games like Roblox and Coin Master. The document body, though partially corrupted, contains references to these lures and the primary malicious URL. The presence of embedded URLs and the ML classifier's strong flagging indicate a high likelihood of malicious intent, likely to lead users to phishing or malware download sites.

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.tw/app/431946152/hack-server-vip-roblox-game-hack In PDF document text
    • https://learnwmf.org/image/data/files/free-robux-app_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/10-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/robuxfree-con_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/is-windows-10-minecraft-free_GM479516143.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-free-raid-link_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/roblox-dayz-cheat-code_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-game-free_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/hacks-roblox_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/roblox-script-hacks_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_off00004d28.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D28 26496 bytes
SHA-256: 8a2dcb9de2543517b7981ffc910a44e329555bc412d5208f3f27b33af52032a1
font_01_sfnt_off000088df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88DF 18728 bytes
SHA-256: 9dd36bc0ad253294403749292ab5208d0327a6b86842b291811ea1ea5778bc2e

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