Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf0a80f5c374c0a…

MALICIOUS

PDF

44.4 KB Created: 2021-05-11 05:03:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 07f6bd22c5df3bf6393335491ea4f010 SHA-1: 49c54d01db61fc348e73297f50e20e07f79a0fc7 SHA-256: caf0a80f5c374c0a52ffe23a31ef983efab5af08ab87e8548034c62cbfe2023a
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link to a 'free generator / game hack' lure, which is a common tactic for phishing or malware distribution. The presence of a fake CAPTCHA heuristic further supports this, as it's used to trick users into interacting with malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lead the user to a malicious website, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/431946152/free-free-robux-game-hack PDF link annotation
    • http://perpustakaan.pa-jember.go.id/repository/coin-master-heaven-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/coin-master-100-spin-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/get-robux-com_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/robux-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/how-to-make-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/free-coins-spins-on-coin-master_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_off000048f8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48F8 25292 bytes
SHA-256: 1774f13c061db08a75a71c8457fe9ed05b80372467f9a59dfc91e6c94d2151ac
font_01_sfnt_off00008210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8210 2836 bytes
SHA-256: fd98c8f6e7c2e74bbd5822409159a93ac5c94da083ae4c2eb269d4284375f9e8
font_02_sfnt_off00008bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB6 18012 bytes
SHA-256: 3ef9e48aa3d97d4217e004f7625a8cbae9320a74231b80a01553f6433e422360

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