Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f550891fc5234ab…

MALICIOUS

PDF

45.3 KB Created: 2021-06-09 05:21:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 48202cd3c2b7016c7fb11bf824a64f8b SHA-1: d545875d59e130abda877cf40dc1e4c122ca3757 SHA-256: 5f550891fc5234ab4aa9e5125401372694c89547266892f2f763b129ebaa14ec
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, disguised with game-related lures like 'game hack' and 'free robux'. The primary redirector URL is https://netcdn.tw/app/431946152/who-hacked-roblox-to-change-the-thumbnails-of-games-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious workflow designed to lead the user to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/who-hacked-roblox-to-change-the-thumbnails-of-games-game-hack In PDF document text
    • http://algierimasonry.com/images/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/hacking-apps-for-roblox_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/fbchampion_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/how-to-get-a-free-top-hat-in-roblox_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/free-robux-working_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/free-robux-please_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/do-roblox-read-hack-reports_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://algierimasonry.com/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://algierimasonry.com/images/make-free-robux_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
stream_004_off00005192.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5192 24856 bytes
SHA-256: 1896fc943eb15c1567aa52328f594f2d0cbc0124335bbc8a77424523a42be3e4
font_01_sfnt_off00008aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AED 19528 bytes
SHA-256: 88c49c7d8b0e5f14a331837d39fcbeb6c1d969c4926bb0cdb569e6a79e6ff91e

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