Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb5721c6ae7559f…

MALICIOUS

PDF

41.3 KB Created: 2021-05-22 15:19:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 348928700d617c300d8c3fc64e551bc6 SHA-1: d0124b9c1d27827415294edde9d452b7c00f9c1c SHA-256: fdb5721c6ae7559fb46e1590a65b57d798f12990fb09657ad5d0da805a5057cd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering 'free Robux' or 'game hacks', which are common lures for phishing and malware distribution. The document body explicitly mentions 'Free Robux No Human Verification No Survey' and includes a 'CLICK HERE TO ACCESS ROBLOX GENERATOR' call to action, reinforcing the deceptive nature of the content. The embedded URLs point to redirectors and further lure pages, indicating a multi-stage redirection chain designed to deliver a payload or lead the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7534

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.xyz/app/431946152/free-robux-no-human-verification-no-survey-game-hack In PDF document text
    • https://mts.almuhtaduun.com/__statics/gudangsoal/files/roblox-free-login_GM431946152.pdfIn PDF document text
    • https://mts.almuhtaduun.com/__statics/gudangsoal/files/cone-master_GM406889139.pdfIn PDF document text
    • https://mts.almuhtaduun.com/__statics/gudangsoal/files/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • https://mts.almuhtaduun.com/__statics/gudangsoal/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://mts.almuhtaduun.com/__statics/gudangsoal/files/hack-coin-master-android-game_GM406889139.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_002_off00003314.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3314 27632 bytes
SHA-256: b2932ccdddc58dcdf76f3a25a6d6775b5322890a478c626cdca69bd6f41ebf6f
font_01_sfnt_off0000704d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x704D 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00007d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D5E 19156 bytes
SHA-256: 339d1e55aee7c6169fc9e26e1541ea9d6c779f781f53a8c1d652dbe4fbeac478