Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fec7ba5985a676…

MALICIOUS

PDF

46.0 KB Created: 2021-05-17 22:01:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e6ffe11b8953df0c18de31531a9eb2cd SHA-1: 725452c99b7a38dc410d98f2d04bf6617d4ebb23 SHA-256: 21fec7ba5985a6766ef1e401e0530e3e5927f6410cd52ea083889b5421b9262d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to known malicious redirectors and sites offering free game currency or hacks, such as 'how-to-change-username-on-roblox-for-free-game-hack'. The ML classifier also flagged this PDF as malicious. The document body and heuristics indicate a lure for users interested in free in-game items, which is a common social engineering tactic to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/how-to-change-username-on-roblox-for-free-game-hack In PDF document text
    • https://schulzpressetext.de/images/coin-master-village-3_GM406889139.pdfIn PDF document text
    • https://schulzpressetext.de/images/free-coin-master-account_GM406889139.pdfIn PDF document text
    • https://schulzpressetext.de/images/coin-master-admin-free-spins_GM406889139.pdfIn PDF document text
    • https://schulzpressetext.de/images/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://schulzpressetext.de/images/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • https://schulzpressetext.de/images/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • https://schulzpressetext.de/images/minecraft-anarchy-server-no-hacks_GM479516143.pdfIn PDF document text
    • https://schulzpressetext.de/images/free-coins-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://schulzpressetext.de/images/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • https://schulzpressetext.de/images/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • https://schulzpressetext.de/images/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • https://schulzpressetext.de/images/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://schulzpressetext.de/images/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • https://schulzpressetext.de/images/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://schulzpressetext.de/images/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
    • https://schulzpressetext.de/images/www-robux-redeem_GM431946152.pdfIn PDF document text
    • https://schulzpressetext.de/images/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://schulzpressetext.de/images/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • https://schulzpressetext.de/images/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://schulzpressetext.de/images/minecraft-free-download-apk-softonic_GM479516143.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_003_off00004a5d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A5D 26148 bytes
SHA-256: a8fb1b6fae780cdafbb39cdb47eab12f6cb4d4302bb6baf8044b1b208ec63ede
font_01_sfnt_off000084a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84A4 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E8E 19240 bytes
SHA-256: 0a326c0d94e4ba5b42cc4a4255d11f6f465e6ea82f55ecdc2c3181a0308aa342

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