Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c320b3f07e5320…

MALICIOUS

PDF

48.8 KB Created: 2021-06-09 06:36:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: bb49f620600efcbe2f3fca7c8f29cd86 SHA-1: 79877718b7edf13d044df832d362ad28a60351f7 SHA-256: 31c320b3f07e5320cd6a3bc28bde371aae792a9b6ffa3a2b8c5b36c3bfbce23e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to malicious redirectors, specifically advertising 'game hacks' and 'free generators' to lure users. One prominent URL, https://netcdn.tw/app/431946152/legends-of-speed-cheats-roblox-game-hack, is directly associated with a malicious redirector. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/legends-of-speed-cheats-roblox-game-hack In PDF document text
    • http://korporacjaroma.pl/images/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://korporacjaroma.pl/images/free-minecraft-skin-creator_GM479516143.pdfIn PDF document text
    • http://korporacjaroma.pl/images/is-coin-master-free_GM406889139.pdfIn PDF document text
    • http://korporacjaroma.pl/images/freer-pro-tiktok_GM835599320.pdfIn PDF document text
    • http://korporacjaroma.pl/images/coin-master-daily-free-spins-link-today-blog_GM406889139.pdfIn PDF document text
    • http://korporacjaroma.pl/images/code-free-robux_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://korporacjaroma.pl/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://korporacjaroma.pl/images/toolbox-apk_GM479516143.pdfIn PDF document text
    • http://korporacjaroma.pl/images/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://korporacjaroma.pl/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://korporacjaroma.pl/images/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://korporacjaroma.pl/images/play-roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • http://korporacjaroma.pl/images/tiktok-free-hearts_GM835599320.pdfIn PDF document text
    • http://korporacjaroma.pl/images/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://korporacjaroma.pl/images/coin-master-freebies-2021_GM406889139.pdfIn PDF document text
    • http://korporacjaroma.pl/images/tiktok-hearts-free-2021_GM835599320.pdfIn PDF document text
    • http://korporacjaroma.pl/images/earnrobux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53AD 26020 bytes
SHA-256: 4490d1fe9177369d97c5359765d5d1ef5acec641d9e0f2dda8739c3394445390
font_01_sfnt_off00009043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9043 2872 bytes
SHA-256: 5a38050e56bfed6ba013c4835499ae05f4b57b22e606c9172dd4bc2ae7fd1207
font_02_sfnt_off000099ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99FF 18920 bytes
SHA-256: 9cb6fc36e9158b54246c9b2b846dae366c269b912411794e5a645dbaafc7d056

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