Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb33f8b00821de2…

MALICIOUS

PDF

42.0 KB Created: 2021-05-11 05:50:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: da3b9578c545d31f87477c54b47a6aa2 SHA-1: f4a28b74f64700c9d735cd6732ea107577596b51 SHA-256: 4cb33f8b00821de21450b9b47071549f0d28a5b451fd74251ee5ae23ab1da476
200 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, displaying a fake CAPTCHA to entice users to click on a malicious link. This link, 'https://netcdn.xyz/app/406889139/moonactive-free-spins-link-game-hack', redirects to a site offering game hacks, a common social engineering tactic. The document's structure and embedded links strongly suggest an attempt to trick users into executing further malicious actions, likely involving the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/moonactive-free-spins-link-game-hack In PDF document text
    • https://repository.stikesindramayu.ac.id/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/legitimate-coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/robux-now_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/minecraft-bedrock-edition-hacks_GM479516143.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/jailbreak-script_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-spins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/get-free-robux_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_003_off00004a19.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A19 24388 bytes
SHA-256: 1d04ad460e42db15a83d430943d74734d07bf6e581ff117d10a306ce2806d1f3
font_01_sfnt_off00008212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8212 18168 bytes
SHA-256: de83cce042fd98afd312ce6d9ac17b5793122de6df0909979501f1e1abb9aa75

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