Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42bf5aab95deeb6…

MALICIOUS

PDF

44.8 KB Created: 2021-06-04 03:38:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b938250e9639aada3e25f0a887bdb2a7 SHA-1: 10540f69a88a5ab84d2af803bf4d55d79fcfec60 SHA-256: a42bf5aab95deeb6f9a701bd98391b0d74b73b7f10115f0a64d99eb869118584
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple links to known malicious redirectors, including one that masquerades as a 'game hack' lure. The presence of a fake CAPTCHA heuristic suggests the document is designed to trick the user into interacting with these links, likely to download a second-stage payload. No scripts were extracted, but the overall pattern indicates a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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
  • 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/431946152/how-do-you-earn-robux-on-roblox-game-hack In PDF document text
    • http://www.library.smactf.sch.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-hack-apk-july-29_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/free-coin_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/how-to-make-a-minecraft-bedrock-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/robux-download_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-hack-apk-download-for-android_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/coin-master-connection-lost_GM406889139.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
font_00_sfnt_off00004fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FD1 25516 bytes
SHA-256: fb73b8b30d4781747c66655243145ae6d2667cd6b648a750137529e99cea848d
font_01_sfnt_off00008b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B31 18644 bytes
SHA-256: 101d287b90a3798bf945b9e309dfc26ee4a82cf5cf33fc5f39034681ca663b5b

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