Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea85cc201aa86865…

MALICIOUS

PDF

50.4 KB Created: 2021-06-03 22:23:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9fc6633109b3226555f3bc68581aee78 SHA-1: 9d8b0403de96e84e10b98cc87def45dba5242e33 SHA-256: ea85cc201aa868657dc41a021f456dabaf78cf705784c096e38ef75d009e28e2
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking a link. The primary link directs to a malicious redirector infrastructure, likely serving as a gateway to further malicious content or downloads. No scripts were extracted, but the PDF structure and heuristics suggest an attempt to exploit user interaction for initial access, potentially leading to client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.
  • 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
  • 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-game-pack-coin-master-game-hack In PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-tiktok-views-no-verification_GM835599320.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-free-spins-cheat-deutsch_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/roblox-dominus-free_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/minecraft-114-4-download_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/40-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-coin-spin-daily-link-for-coin-master-game_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_004_off000056bf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x56BF 29556 bytes
SHA-256: 7a4c46bbdac30e91cd126160ef551c74068e496fcf15455714cc2959c27e8ad6
font_01_sfnt_off0000977a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x977A 3204 bytes
SHA-256: b7fe42cb1da39e96c756399b3532633df029c1fbb3443b9e17d98df25c90dc65
font_02_sfnt_off0000a27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA27E 18292 bytes
SHA-256: 50801c1212ba10e6fec772be1621f3a9c69628be9ab96fac5d906e32cadaa888

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