Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dffad22dd155d6d…

MALICIOUS

PDF

48.8 KB Created: 2021-06-03 22:13:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c37499506e06846ca86babe95dcb8ffd SHA-1: 42a872739e9deb839d4c85839bea5531cc8ea370 SHA-256: 5dffad22dd155d6d57c8b18da86e4f104ef39e59047e829ac7fd872e8462cf0b
200 Risk Score

Malware Insights

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

The PDF document employs a lure of free Robux and a fake CAPTCHA to trick users into clicking a malicious link. This link, https://netcdn.online/app/431946152/free-robux-generator-no-survey-no-download-no-human-verification-game-hack, is hosted on known malicious redirector infrastructure. The document's structure and embedded URLs suggest an attempt to deliver a secondary payload or redirect the user to a phishing or scam website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/431946152/free-robux-generator-no-survey-no-download-no-human-verification-game-hack In PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-bux-free_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/hack-master-coin_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-iphone_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coins-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-september-2021_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-spins-link-without-human-verification_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-android-2021_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-hack-generator_GM431946152.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_off00005294.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5294 25524 bytes
SHA-256: 3ffcd6daa8d0e271ef22493acfc7fcc56d17ad2d96321668b3ae237afc26812f
font_01_sfnt_off00008e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E07 2832 bytes
SHA-256: 78e89c8f621d90011ffb7a2107d701d4cdf090a2f2cf42d5a65297289afc8805
font_02_sfnt_off000097b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97B8 19736 bytes
SHA-256: 3cea6d4f9da734904bcc55369e0b79f4621aa36195ab65246c463812034b9480

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