Malicious PDF — malware analysis report

Static analysis result for SHA-256 16df4cc1c6b39823…

MALICIOUS

PDF

33.4 KB Created: 2021-07-20 12:48:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9cf0d2a3b758944c797796efc484f249 SHA-1: 6b77b12a2ce0c8bce175ce032971877946bac5a2 SHA-256: 16df4cc1c6b39823e32a1ef3826f8db48e8d83bf9c9468595f2835701d4a14ad
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector, disguised as a 'free generator / game hack' lure. The document body explicitly mentions 'Get Free Robux 2021' and includes a call-to-action to 'CLICK HERE TO ACCESS ROBUX GENERATOR', reinforcing the scam pretext. While no scripts were extracted, the presence of embedded URLs and the nature of the lure strongly suggest a phishing or social engineering attack aimed at redirecting users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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/get-free-robux-2021-game-hack In PDF document text
    • http://elearning.mtsn2buleleng.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn2buleleng.sch.id/__statics/gudangsoal/files/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn2buleleng.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2buleleng.sch.id/__statics/gudangsoal/files/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn2buleleng.sch.id/__statics/gudangsoal/files/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2buleleng.sch.id/__statics/gudangsoal/files/free-robux-script_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2buleleng.sch.id/__statics/gudangsoal/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2buleleng.sch.id/__statics/gudangsoal/files/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn2buleleng.sch.id/__statics/gudangsoal/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2buleleng.sch.id/__statics/gudangsoal/files/how-to-get-hacks-on-minecraft_GM479516143.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
stream_002_off00002b4c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2B4C 23064 bytes
SHA-256: 5a4e12b415c68e041fd073b535ba2556520b9e987072661e8a8cc3f11b5c8041
font_01_sfnt_off00005f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F43 18708 bytes
SHA-256: 40c7a65fceaaf83cb97aa7fc463573c7ac7212173c6b25107aa06e33ac478d47

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