Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39d99ed57929469…

MALICIOUS

PDF

42.3 KB Created: 2021-05-11 04:31:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1242f0ee5244ba34a8c073f4131acb74 SHA-1: 8924b7521678891a22bc8ecd08f1ffde94d3eb15 SHA-256: b39d99ed5792946918c484c43ffeefdc44e1458f18dd2c55bb67f0d44f1fb5b3
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and sites offering 'free generators' or 'game hacks'. It employs a fake CAPTCHA lure to trick users into interacting with these links, likely leading to further malicious content or downloads. The ML classifier strongly flagged this PDF as malicious, supporting the observed redirection and lure techniques.

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/431946152/robux-free-gift-card-org-hack-game-hack In PDF document text
    • http://dqdq.pl/images/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://dqdq.pl/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://dqdq.pl/images/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://dqdq.pl/images/free-pet-snacks-coin-master_GM406889139.pdfIn PDF document text
    • http://dqdq.pl/images/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://dqdq.pl/images/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://dqdq.pl/images/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://dqdq.pl/images/coin-master-game-hack-version-download_GM406889139.pdfIn PDF document text
    • http://dqdq.pl/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://dqdq.pl/images/roblox-install-free_GM431946152.pdfIn PDF document text
    • http://dqdq.pl/images/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://dqdq.pl/images/minecraft-windows-10-mod-menu_GM479516143.pdfIn PDF document text
    • http://dqdq.pl/images/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://dqdq.pl/images/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • http://dqdq.pl/images/coin-game_GM406889139.pdfIn PDF document text
    • http://dqdq.pl/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://dqdq.pl/images/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://dqdq.pl/images/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
    • http://dqdq.pl/images/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://dqdq.pl/images/free-spin-link_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_off000047e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47E4 24696 bytes
SHA-256: 7b5422e52169e0ffcfddfebedd9d5e01fbf7af1e2070e0e94e8c6b4a277ceef2
font_01_sfnt_off00008061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8061 19096 bytes
SHA-256: bb2bfd1b5c80cb1744cd57562806e4410c1e72fb9e1ed3dff7cfd9b3dcead9ac

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