Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71c16f8a9ac8a5a…

MALICIOUS

PDF

34.9 KB Created: 2021-07-06 11:38:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 83b90a426bdc83c4d3d741f24b8ebad0 SHA-1: 92d7be3cc33c45bb2203c5f19344db7168d1baa4 SHA-256: c71c16f8a9ac8a5a037200593010323259b02c9cda2d75820e6701543b9cff3c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of free in-game currency and hacks. The document body and embedded URLs strongly suggest a phishing or scam attempt designed to trick users into visiting malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector is in use.

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-discord-servers-game-hack In PDF document text
    • https://ourlady-elearning.com/userfiles/files/my-roblox-girlfriend-cheated-on-me_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/flip-master-free-coins_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-15-free-spin-link-today_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-hack-mod_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/el-mayor-hacker-de-roblox_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/roblox-com-free-play_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-minecraft-skin-creator_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-email-free-spins_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-hack-apk-latest-version-2021_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-free-coins-link-facebook_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-minecraft-account-reddit_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/pokemon-go-mod-apk-joystick-free-download_GM1094591345.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_off0000311c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x311C 22408 bytes
SHA-256: 05722b583d93d88cb7a06226bd8395c172e7e474ca9498fcd35b04329173d29f
font_01_sfnt_off000062c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C5 19292 bytes
SHA-256: b115a2c924602d7af6df8e60d1d5a0905588960aaa46bc3f51eeaab49e44319b

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