Malicious PDF — malware analysis report

Static analysis result for SHA-256 635aa6679a4cd694…

MALICIOUS

PDF

43.0 KB Created: 2021-05-21 17:07:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e973232751cc6a63071dcb5811adb48f SHA-1: 5d7f57d791aee69c4ae9bb70adf91df5224c8978 SHA-256: 635aa6679a4cd694f0a5e5da4f34d925d2e2973c17ad0772b80e017334eba880
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to malicious redirectors, masquerading as game hacks and generators. It also employs a fake CAPTCHA lure to trick users into interacting with the document. The ML classifier also flagged this PDF as malicious. No scripts were extracted, but the embedded URLs suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7429

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://www.metinadistribuzione.com/images/hack-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • http://www.metinadistribuzione.com/images/coin-master-hack-software-download_GM406889139.pdfIn PDF document text
    • http://www.metinadistribuzione.com/images/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • http://www.metinadistribuzione.com/images/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.metinadistribuzione.com/images/www-roblox-com-robux-free_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_002_off00003457.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3457 31172 bytes
SHA-256: dacbfffb229bfd767e0f34ec59f0a2b65216e68cfe3a584e3b9d957a36f17eaa
font_01_sfnt_off00007a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6D 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off0000842e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x842E 19096 bytes
SHA-256: bb2bfd1b5c80cb1744cd57562806e4410c1e72fb9e1ed3dff7cfd9b3dcead9ac

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