Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb9f1c7e0c69307…

MALICIOUS

PDF

41.1 KB Created: 2021-05-10 16:48:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d69ceb8ad1efbef05a7957670f209d48 SHA-1: 9c1ff6fc0fca917ad6df33973646638feb1144ed SHA-256: 1fb9f1c7e0c69307d5f0c18df249112cfe9815f93afffd032a2c95171e33621b
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document employs a fake CAPTCHA and a lure for a 'game hack' to trick users into clicking embedded links. The primary link directs to a known malicious redirector infrastructure, suggesting an attempt to deliver a second-stage payload or phish for credentials. No scripts were extracted, but the PDF structure and heuristics indicate a malicious intent to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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/coin-master-hack-apk-2021-download-game-hack In PDF document text
    • http://aadvanderklaauw.nl/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://aadvanderklaauw.nl/images/minecraft-launcher-download-free_GM479516143.pdfIn PDF document text
    • http://aadvanderklaauw.nl/images/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://aadvanderklaauw.nl/images/can-i-have-robux_GM431946152.pdfIn PDF document text
    • http://aadvanderklaauw.nl/images/coin-master-free-spin-27_GM406889139.pdfIn PDF document text
    • http://aadvanderklaauw.nl/images/coin-master-free-coins-app_GM406889139.pdfIn PDF document text
    • http://aadvanderklaauw.nl/images/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://aadvanderklaauw.nl/images/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://aadvanderklaauw.nl/images/coin-master-free-spins-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://aadvanderklaauw.nl/images/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://aadvanderklaauw.nl/images/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • http://aadvanderklaauw.nl/images/coin-master-hack-extension_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
stream_003_off000041bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x41BD 25608 bytes
SHA-256: 54b3b8a37b03ac9208a353f93c89d1d7068f3cc16d893e68647900704aa1f27d
font_01_sfnt_off00007ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CEB 18876 bytes
SHA-256: be5be3eecf441f83945d2891df9f868a1d3a5dfc921b9d485f27c984001e53f9

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