Malicious PDF — malware analysis report

Static analysis result for SHA-256 91394c12cf31eea9…

MALICIOUS

PDF

43.6 KB Created: 2021-06-03 08:26:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a7dc3b096ed63221abc96b8fc6fc3676 SHA-1: 625292413fc0882c8b41cb2bcdfa624a3f4c9b25 SHA-256: 91394c12cf31eea92bf8c45fa14c2bea2c142f6ef2f1f1733898365f8dccb453
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs and a heuristic firing for an external URI, suggesting it is designed to redirect users to external websites. The document body, though heavily obfuscated, contains text related to game cheats and downloads, aligning with a social engineering lure. The ML classifier also flagged the PDF as malicious.

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.online/app/479516143/is-minecraft-earth-free-game-hack In PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-spin-daily-bonus_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/rbx-sites_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/pasos-para-hackear-coins-master_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-getting-hacked_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-spins-link-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/real-working-coin-master-hack_GM406889139.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_off00005148.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5148 24824 bytes
SHA-256: 9e5cdd9ea7d0638c021d11d71294c8d7eaccad53bda179424746a46642f4cf99
font_01_sfnt_off00008999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8999 17736 bytes
SHA-256: 1e0abad8bc2810b5e4489737ca45e17fd168e3cfd490dec885df951617a2e0b9

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