Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aca19d57b8deeff…

MALICIOUS

PDF

41.6 KB Created: 2021-05-11 06:06:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7e7e83e061f88075b5c7d00f047e7898 SHA-1: 6c7fcc005cd882198f286cb845d976a37bb2d0c1 SHA-256: 5aca19d57b8deeffd37aa438317dac4a0096bb6adf3f0ec3c3188750e8577f82
200 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a game hack redirector lure, displaying a fake CAPTCHA to trick users into clicking a malicious link. The embedded URL leads to known malicious infrastructure, suggesting an attempt to redirect users to a site that may host further malware or phishing content. While no scripts were explicitly extracted, the nature of the lure and the presence of multiple redirector links indicate a high likelihood of a client-side exploitation or download attempt.

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/spin-coin-master-game-hack In PDF document text
    • http://falconshipping-uae.com/userfiles/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/how-do-i-get-robux_GM431946152.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/how-to-get-free-skins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/coin-master-ids-for-free-spins_GM406889139.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/roblox-lovenet_GM431946152.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/robux-game_GM431946152.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/roblox-com-redeem_GM431946152.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/hacks-for-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/coin-master-2021-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/coin-master-hack-apk-ios_GM406889139.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/robux-hacks-2021_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_off00004948.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4948 25180 bytes
SHA-256: aea95b1e4fa9f886b5f6b8e755ccddb332fcda60d74e41254109530eedcf3855
font_01_sfnt_off000081a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81A6 17724 bytes
SHA-256: a288a8875d4658f6069a8caac4ff820547a50f75967c18edc494040e7262f101

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