Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8da824756e28ea8…

MALICIOUS

PDF

35.6 KB Created: 2021-07-04 10:43:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e52784a925cc67212a9f8e8194dd26ed SHA-1: 12e0f96d52251b20666b3e3d8aedbbfcc0e7e9cb SHA-256: a8da824756e28ea8474b85931be2f1c29f99201504e7d82924afb0ed480e001b
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a malformed stream and links to known malicious redirector infrastructure. The primary lure is a link to 'tiktok-minecraft-hacks-game-hack', which is designed to entice users to click through to potentially malicious content. The ML classifier strongly indicated maliciousness, supporting the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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/479516143/tiktok-minecraft-hacks-game-hack In PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/robux-star-code-free_GM431946152.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/50-000-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/hacker-des-compte-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/get-1-robux-free_GM431946152.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-mac-2021_GM431946152.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/roblox-com-free-codes_GM431946152.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/how-do-you-hack-roblox-kick-off_GM431946152.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000035b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35B8 23016 bytes
SHA-256: 433e1836675c5c27183a12631c26c77bf4ca4e865bf19afe165fbc13702fa6e5
font_01_sfnt_off0000690c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x690C 18168 bytes
SHA-256: 49b148a5ca756e3f3293ae7356a748e2214796aae6d20bfd78280b7e22c0c315

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