Malicious PDF — malware analysis report

Static analysis result for SHA-256 c819b15777fc8a03…

MALICIOUS

PDF

48.9 KB Created: 2021-06-03 14:11:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 89e7e3062b0bf8a06c0adb57b1e06ab7 SHA-1: 6180aa3c8bf770bcb3ad728c6d647dab6585affc SHA-256: c819b15777fc8a03c6fe38e5960d568bba8188d0c296d9b59c6dc36c568b0a15
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains an embedded URI pointing to a suspicious URL, and a machine learning classifier flagged it as malicious. The document body, though partially corrupted, suggests a lure related to "free links" for a game, likely intended to trick the user into downloading a second-stage payload. The presence of multiple similar URLs reinforces the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/406889139/free-links-coin-master-game-hack In PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/master-coins-free_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/wurst-18_GM479516143.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/moon-active_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/minecraft-app-free-download_GM479516143.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/rbx-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-hack-version-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/rbx-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_004_off00005249.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5249 29904 bytes
SHA-256: b0c58b06fc59aa33825648dd2731889dceaa56b1a31982c2faef556bf721d386
font_01_sfnt_off00009408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9408 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DBB 17880 bytes
SHA-256: c5130e18caf6f7222c4492e4e2e2fc6b4580e14129763dcab090a363ad6db2dc

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