Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b809a5bea7a6d8…

MALICIOUS

PDF

36.6 KB Created: 2021-05-20 18:53:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b9bb0fbde0fee272bd7af59cd4811190 SHA-1: 853ec72e98792a89d6954d3eaf5e77cc9aeb6666 SHA-256: d1b809a5bea7a6d8deed32787d981ae4cb31635d190437fa6b38219823b93cae
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as game hacks and free spin generators. The embedded document body and heuristics indicate a lure to trick users into clicking these links, likely leading to further malicious content or downloads. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/406889139/coin-master-free-spins-haktuts-game-hack In PDF document text
    • http://proyetec.com.co/aym_image/files/coin-master-hack-facebook_GM406889139.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/download-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/free-robux-live_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/roblox-sexually_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_002_off00003326.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3326 25616 bytes
SHA-256: 6774225aea40cebff1ca8c8b71783713d7efe24506b4090f3735ea7303dc8685
font_01_sfnt_off00006e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0F 18196 bytes
SHA-256: 60e5d1f6f12937761343702ff54c0624bbba5eb6b748e0cd555839fa9283373b

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