Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1a426d8b1366f0…

MALICIOUS

PDF

51.8 KB Created: 2021-06-04 02:22:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d416b1f596b0c6682002ac65e5527d25 SHA-1: 797ee1abbc170fb7d6f0bb2d5b7fe7f4792b9b4c SHA-256: ff1a426d8b1366f0d26bccdc177062dfa025859a6bd51f4a4ec45e5b66e86489
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to malicious infrastructure, masquerading as game hacks or generators. The ML classifier also flagged this PDF as malicious. The primary lure appears to be a 'free generator' for Roblox, directing users to a malicious URL. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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/431946152/roblox-how-to-make-a-game-thumbnail-for-free-game-hack In PDF document text
    • http://www.library.gkigadingserpong.org/repository/info-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-strategy_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-heaven-daily-free-spins-and-coins-links_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-roblox-codes_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-star-codes-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/robux-converter_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000513f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x513F 24564 bytes
SHA-256: cc66a03c2cdf311cf4f1db705fe3a2f75c32113ab850bf36b82060983e18f7bc
font_01_sfnt_off00008966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8966 2832 bytes
SHA-256: 78e89c8f621d90011ffb7a2107d701d4cdf090a2f2cf42d5a65297289afc8805
font_02_sfnt_off00009312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9312 7272 bytes
SHA-256: f462303657ce1de10d3e7d5ae1fe17c8584116bd5bc216971166de87266da924
font_03_sfnt_off0000a483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA483 19392 bytes
SHA-256: fa9beab79367f654bba28c0a0d6720c61549e58e45c966cb69ce35df20a20a62

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