Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca262ae904d05ba8…

MALICIOUS

PDF

36.7 KB Created: 2021-05-21 22:10:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 58737a3e968262635225bf820642ff96 SHA-1: 714500b14d03ecdb90a603ac9c8c242954993760 SHA-256: ca262ae904d05ba82cd40571c7742bee5b12e824acff33341101e779152c6753
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors, disguised as 'free generator' or 'game hack' lures. These links likely lead to further malicious content or malware downloads. The ML classifier also flagged this PDF with high confidence, supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 4

  • 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.
  • 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/get-free-robux-now-game-hack In PDF document text
    • http://gavertrimmers.be/images/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://gavertrimmers.be/images/coin-master-hacked-apk-download-for-android_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://gavertrimmers.be/images/tiktok-free-like-app_GM835599320.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_002_off00003024.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3024 27932 bytes
SHA-256: 3c8b92ddbdfdb2b85d4d80c7093e34234e5e94c8af2bf92e137efac56c55ffe1
font_01_sfnt_off00006e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0E 18280 bytes
SHA-256: 538c9dd0db01d2f7ccbac1c4b1e59781ee6b2d24c7879b3cb67aab50807a8027

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