Malicious PDF — malware analysis report

Static analysis result for SHA-256 9938d5cd86841b1c…

MALICIOUS

PDF

45.3 KB Created: 2021-05-10 23:08:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1a72c39972737d8256172594da9caae3 SHA-1: a0d31533dc20dfcb072e1cb7e68cda61123dadd0 SHA-256: 9938d5cd86841b1ca6733412b0181e05ae1da0914162b8fc60b63cabb09633fa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one that redirects to malicious infrastructure associated with game hacks and free currency lures. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the redirection to known malicious domains indicate a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9551

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/link-for-free-spins-on-coin-master-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-hack-co_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-coin-master-glitches_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/robux-sign_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-spins-on-coin-master-hack_GM406889139.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_off000048d0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48D0 24648 bytes
SHA-256: 08f8e03cb2f64a786c9d25e414dbf3697c427a008140488b1e09ac7e47559394
font_01_sfnt_off000081b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81B4 4020 bytes
SHA-256: dbaa9c12d07f3632734605f1d5d6dee3ad5af1f57488e46d95dab68b383f08c5
font_02_sfnt_off00008f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F3B 18056 bytes
SHA-256: 722d781e478cd0d1a4785e673d05427d87221dd2f44d1d4595ffa323240eece4

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