Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f1d4cf8475453c…

MALICIOUS

PDF

33.4 KB Created: 2021-07-06 04:33:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d69ddea0049b25f11a80bf807a94b93a SHA-1: 74a8eef656bd5d8e7188a31f9dfc5060d54f5225 SHA-256: f4f1d4cf8475453c1be99a1f307183e24e4f87b35b02db16bef1e4747a42e875
180 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a lure for free game currency or hacks. The document body and embedded URLs reinforce this theme. The ML classifier also flagged this PDF with high confidence, suggesting it is designed to exploit users by directing them to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 5

  • 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.
  • 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-earn-game-hack In PDF document text
    • https://elearning.masnurulhidayahcibadak.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://elearning.masnurulhidayahcibadak.sch.id/__statics/gudangsoal/files/how-to-get-free-items-in-roblox-tagalog-2021-march_GM431946152.pdfIn PDF document text
    • https://elearning.masnurulhidayahcibadak.sch.id/__statics/gudangsoal/files/super-easy-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.masnurulhidayahcibadak.sch.id/__statics/gudangsoal/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://elearning.masnurulhidayahcibadak.sch.id/__statics/gudangsoal/files/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.masnurulhidayahcibadak.sch.id/__statics/gudangsoal/files/coin-master-33-hack-version-download_GM406889139.pdfIn PDF document text
    • https://elearning.masnurulhidayahcibadak.sch.id/__statics/gudangsoal/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.masnurulhidayahcibadak.sch.id/__statics/gudangsoal/files/coin-master-34-4-free-download_GM406889139.pdfIn PDF document text
    • https://elearning.masnurulhidayahcibadak.sch.id/__statics/gudangsoal/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.masnurulhidayahcibadak.sch.id/__statics/gudangsoal/files/minecraft-apk-android-free_GM479516143.pdfIn PDF document text
    • https://elearning.masnurulhidayahcibadak.sch.id/__statics/gudangsoal/files/roblox-guest-pants-free_GM431946152.pdfIn PDF document text
    • https://elearning.masnurulhidayahcibadak.sch.id/__statics/gudangsoal/files/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • https://elearning.masnurulhidayahcibadak.sch.id/__statics/gudangsoal/files/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • https://elearning.masnurulhidayahcibadak.sch.id/__statics/gudangsoal/files/wwwcoin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • https://elearning.masnurulhidayahcibadak.sch.id/__statics/gudangsoal/files/free-cracked-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://elearning.masnurulhidayahcibadak.sch.id/__statics/gudangsoal/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://elearning.masnurulhidayahcibadak.sch.id/__statics/gudangsoal/files/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • https://elearning.masnurulhidayahcibadak.sch.id/__statics/gudangsoal/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://elearning.masnurulhidayahcibadak.sch.id/__statics/gudangsoal/files/pokemon-go-free-account-2021_GM1094591345.pdfIn PDF document text
    • https://elearning.masnurulhidayahcibadak.sch.id/__statics/gudangsoal/files/free-robux-games-on-roblox_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_off00002d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D31 22316 bytes
SHA-256: db30c323601e746cb29f9a32d00b950e2e1c46e641140dfec2a8373f7f5b6e27
font_01_sfnt_off00005ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED9 18716 bytes
SHA-256: d0fd5caa07bd2994d5aead91e3f120989a872bbf6995ac2693ef7a49b18a3472