Malicious PDF — malware analysis report

Static analysis result for SHA-256 b751fa8a3fad097a…

MALICIOUS

PDF

44.3 KB Created: 2021-06-07 16:41:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2f8e6628dd16e6585792bd411541600d SHA-1: bf66faf9349a3b440e1427a32dc26a3a6c31c1f4 SHA-256: b751fa8a3fad097ab39aa7ef0dacd7fdb6e7324ac5b407b4de8e92d27032b8ea
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links disguised as generators and hacks for popular games, which are flagged as malicious redirectors. The primary lure is the promise of 'Roblox Free Clothes Generator 2021'. While no scripts were directly extracted, the embedded links and heuristic firings strongly suggest a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/roblox-free-clothes-generator-2021-game-hack In PDF document text
    • http://schrichte.de/images/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/how-to-make-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/coin-master-free-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://schrichte.de/images/legit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://schrichte.de/images/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • http://schrichte.de/images/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://schrichte.de/images/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/free-coins-for-coin-master-blogger_GM406889139.pdfIn PDF document text
    • http://schrichte.de/images/free-minecraft-domain_GM479516143.pdfIn PDF document text
    • http://schrichte.de/images/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/coin-master-heaven-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://schrichte.de/images/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://schrichte.de/images/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://schrichte.de/images/coin-master-free-500-spins-link_GM406889139.pdfIn PDF document text
    • http://schrichte.de/images/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://schrichte.de/images/free-robux-discord-servers_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_off00004e09.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E09 26664 bytes
SHA-256: 975cb7de2393bf3716b758f60eb3e8d6427f9b5243e876143a74251be1b5f4ec
font_01_sfnt_off000088d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88D6 18848 bytes
SHA-256: 02ab96211342293d87f612356ba482a5e6a315090305569b5eb77167a2fc0370

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