Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e735475b33b6596…

MALICIOUS

PDF

33.7 KB Created: 2021-07-06 21:36:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0b3ff1f1bf48f482372c067708c5bf2f SHA-1: c12c42ea365282f7bbbc68519a65cf1d79edcb6e SHA-256: 2e735475b33b6596f6bd517fa7d308d27c1bc5fc6083f1ee7be474f3f64bcc4c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a critical link to a known malicious redirector infrastructure at http://netcdn.tw/app/406889139/hack-version-coin-master-apk-game-hack. The document body and heuristics indicate a lure for game hacks or generators, suggesting the intent is to trick users into downloading malware. No scripts were extracted, but the embedded URLs and the nature of the lure strongly suggest a malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/hack-version-coin-master-apk-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/group-roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/robloxworld-pw-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-website-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-roblox-acc_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/hacks-for-roblox-case-clicker_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-make-a-free-robux-game_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-roblox-hair-codes_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-roblox-accounts-with-robux-and-bc_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/como-conseguir-robux-gratis-sin-hacks-android-y-pc_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/download-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-groups-2021_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
font_00_sfnt_off00002e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E8A 22648 bytes
SHA-256: 68dfd76d3d891977cd68e4c4502059033ec8d08716c638cc96129c681d1891b8
font_01_sfnt_off000060c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C0 18312 bytes
SHA-256: 1e877e07632bab27186de997fb957c4ec29a664bf5680c96f352a5143a3b1dc5

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