Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eaebe8cd53331b3…

MALICIOUS

PDF

48.7 KB Created: 2021-06-09 17:26:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a4b9c0986b7fa598342b86eb54fd0087 SHA-1: f25918576e6c2b66f1b3d5cd0608e008e8d5f1ee SHA-256: 2eaebe8cd53331b333332059a7a0ad075a8c9275e341097ab3986863f8b4ae5d
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 lures users with fake game hack generators, presented as a CAPTCHA. The embedded document body text and extracted URLs strongly suggest a social engineering attack aimed at tricking users into visiting malicious websites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links indicate a high likelihood of further malicious activity, such as downloading additional payloads or redirecting to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.tw/app/431946152/pastebin-roblox-robux-free-2021-game-hack In PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-ka-tik-tok_GM835599320.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/best-roblox-jailbreak-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spin-and-trading-group_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/cone-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-gold-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-mast-hacks_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_004_off00005219.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5219 32076 bytes
SHA-256: 24a5709c7ded18d8f798b6b7d41f6a2a38c8788cfa35d6ea89611974a335c1ab
font_01_sfnt_off00009986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9986 19096 bytes
SHA-256: 83a381f24599a1c2a298d6dbe8d8789c1ced052abcb4402ad3a02701d744c69b

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