Malicious PDF — malware analysis report

Static analysis result for SHA-256 1444a2d5687092dc…

MALICIOUS

PDF

46.4 KB Created: 2021-05-13 23:11:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 67725066a634df81f587b807587575c7 SHA-1: 12596de1f1ca5a53d0fe1e1c6edd34f12fbeb4d2 SHA-256: 1444a2d5687092dce81dec95566653df22c74b6a40e1cf55a7b9ce54212998b8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and free currency to entice users. It contains multiple embedded URLs that redirect to malicious infrastructure, specifically identified as a malicious redirector. The ML classifier also flagged this PDF as malicious, supporting the observed malicious links and lure content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/406889139/free-attacks-on-coin-master-game-hack In PDF document text
    • http://sfera-express.ru/images/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • http://sfera-express.ru/images/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/coins-master-hack_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/coin-master-hack-apk-download-latest-version_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/coin-master-card-hack-apk_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/how-to-get-more-robux-for-free_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_003_off00004b8f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B8F 25188 bytes
SHA-256: b7dba7524204cf82e88b581d1af9beb0f93183fc01a5cc698e83b3fc69ae2f70
font_01_sfnt_off000084fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84FA 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00009024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9024 19208 bytes
SHA-256: 3047281b97f233edbe628a66f8e520d5532b05673e448571186aad593947c6bc