Malicious PDF — malware analysis report

Static analysis result for SHA-256 117d36aefa31a4e4…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 02:59:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 65b666a2991f1e9dea92bf126491d846 SHA-1: 36b956101ea049eef4323dbf1f767e078a46696b SHA-256: 117d36aefa31a4e4f1acb3b5c50847bdd9cfa35aa44b3f4052c5d2264ecef57e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/free-robux-websites-that-work-game-hack. The document body and embedded links suggest a lure for game-related cheats or currency, aiming to trick users into downloading further malicious content. No scripts were extracted, but the presence of malicious redirectors and the lure indicate a high likelihood of a downloader or phishing campaign.

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/431946152/free-robux-websites-that-work-game-hack In PDF document text
    • https://lib.insan-unggul.ac.id/repository/robux-sign_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/roblox-pubg-hack_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/gift-robux-free_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/como-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-34-6-hack_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-robux-that-works-2021_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/money-hack-roblox-pizza-place_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/how-to-get-free-hair-on-roblox-no-hack_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/what-tiktok-free-likes_GM835599320.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/how-to-hack-someone-without-their-password-roblox_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/freerobuxcodegenerator-roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-roblox-checker_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-free-400-spin-link_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/robux-app_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_off000030eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30EB 22304 bytes
SHA-256: 7cb6028486718656c3b10990a9f7e6903e3a20d1d08bf871933a59df548c5db0
font_01_sfnt_off0000627c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x627C 19472 bytes
SHA-256: bfabc7e6efd8369602acc342ff88857307d2346fa8526096ff81aa8b1deb03d6

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