Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ae00262ed8e902…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 22:46:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: eab7b7d35ea268184b186f9a566d2e9b SHA-1: 736cfc9c4efb8386a98d218028b98b5e9196b4a0 SHA-256: e3ae00262ed8e9024a27e1dbb48bd67b4b054071861ac02e7fc156b4ab1f1177
188 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and links to a known malicious redirector infrastructure. The document body and heuristics indicate a lure for game hacks or generators, specifically targeting Coin Master and Roblox. The embedded JavaScript likely facilitates the redirection or further payload delivery, exploiting the user's interest in obtaining free in-game currency or hacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://netcdn.tw/app/406889139/get-free-spins-coin-master-2021-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/roblox-robloxs-mod-rmod-r-mod-hack_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/safe-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coinmaster-spin-ml-link_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/mcpe-master-coins-hack-download_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-apk-hack-download_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-site_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/hack-para-jailbreak-roblox-pc_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/cheat-engine-not-working-on-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/haktuts-coin-master_GM406889139.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_002_off0000316e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x316E 23284 bytes
SHA-256: 53e3521a5bc505c998c9a1b9b5bc7adf01fd3ad0369618d2f07272e67445e8a6
font_01_sfnt_off00006632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6632 18576 bytes
SHA-256: 47068641d4cd5afad495b2744cbb78709b2a1d88425159384b1e35df59296f67

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