Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cf4d470f757eac…

MALICIOUS

PDF

45.2 KB Created: 2021-06-03 10:56:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 998514e481e45b8ad01c74ef5646ca8f SHA-1: caf21bcaf36e936ee4def055481e0d7683f1bc07 SHA-256: 19cf4d470f757eacd9e16594eac25adbaa9411e0e3211789328b58c9808d6af9
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, disguised as game hacks and generators. The document body, though heavily obfuscated, contains references to these lures and the redirector URL. The presence of a download button lure and password-protected archive lure suggests a multi-stage attack designed to bypass security controls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/kachifpro-game-hack In PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/hacks-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-35-16-hack-apk_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/how-to-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/pokemon-go-free-account-username-and-password_GM1094591345.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • http://e-library.smkn1jombang.sch.id/repository/roblox-play-now-for-free_GM431946152.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_off000053a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53A5 26764 bytes
SHA-256: 1972a113ea66a1bcbab3b67f02ab22aca60dcf0545b16afe9420b8373847558f
font_01_sfnt_off00008fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA0 17784 bytes
SHA-256: f5f16e9fe06415f99f9f196ec79e922628d3dac9c37f6a7894d79eeb781dffd0

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