Malicious PDF — malware analysis report

Static analysis result for SHA-256 20771b0ddb615b45…

MALICIOUS

PDF

47.0 KB Created: 2021-05-15 07:33:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 80bd302f51b36ec814c88239a39dbe64 SHA-1: dcada466685647968220bc8a730cd67cfbb63870 SHA-256: 20771b0ddb615b45bf6d18128914d5edc56a2cf241ceaaff95af20664c3aaa5f
188 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and multiple links to known malicious redirectors, disguised as game hack generators. The primary lure is the promise of free in-game currency or account hacks for popular games. The embedded JavaScript and malformed stream length indicate an attempt to exploit PDF vulnerabilities for client execution, likely leading to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 6

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/431946152/how-to-hack-roblox-accounts-passwords-game-hack In PDF document text
    • https://lobergetart.se/images/coin-master-game-free_GM406889139.pdfIn PDF document text
    • https://lobergetart.se/images/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://lobergetart.se/images/coin-master-game-legitimate-hack-without-signing-up-or-shareing_GM406889139.pdfIn PDF document text
    • https://lobergetart.se/images/offers-for-robux_GM431946152.pdfIn PDF document text
    • https://lobergetart.se/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://lobergetart.se/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://lobergetart.se/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://lobergetart.se/images/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://lobergetart.se/images/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://lobergetart.se/images/abd-roblox_GM431946152.pdfIn PDF document text
    • https://lobergetart.se/images/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lobergetart.se/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://lobergetart.se/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://lobergetart.se/images/get-free-robux_GM431946152.pdfIn PDF document text
    • https://lobergetart.se/images/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • https://lobergetart.se/images/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • https://lobergetart.se/images/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • https://lobergetart.se/images/minecraft-creative-mode-free_GM479516143.pdfIn PDF document text
    • https://lobergetart.se/images/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://lobergetart.se/images/daily-spin-and-coin_GM406889139.pdfIn 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_off00004b0f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B0F 26476 bytes
SHA-256: 946b33cf176aa8bf3b5688c3bc6b0872ab6567e32f9297602059a7f8016d7641
font_01_sfnt_off00008949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8949 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off00009359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9359 18916 bytes
SHA-256: 1a35cdd5966ddf5a07fa4c0cf1a4b7623ebf18d314e768fc1998c6779142cc7b

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