Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac45f77b5f44a45…

MALICIOUS

PDF

35.4 KB Created: 2021-05-21 09:41:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2e5f936e64ec9e49324e937027eaf15b SHA-1: e27341b1a0426d5fe007d0dc39c013a26e45323d SHA-256: eac45f77b5f44a458b5dc8771b0637580e62964fbc35440890d0754d60fd3df2
168 Risk Score

Malware Insights

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

The PDF contains multiple links to redirector domains, identified as malicious by heuristics. The document body and embedded links suggest a lure for 'free college textbooks' and 'game hacks', aiming to entice users to click through to potentially malicious content. The ML classifier also flagged this PDF with high confidence. While no scripts were directly extracted, the nature of the links and the lure indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/835599320/free-college-textbooks-tiktok-game-hack In PDF document text
    • http://libertad74.com/images/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://libertad74.com/images/download-hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://libertad74.com/images/hack-coin-master-spin-apk_GM406889139.pdfIn PDF document text
    • http://libertad74.com/images/roblox-inappropriate_GM431946152.pdfIn PDF document text
    • http://libertad74.com/images/daily-coin-master-free-spin-link-facebook_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_002_off00003291.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3291 23940 bytes
SHA-256: d6c5850e44b64102aa6aa113e1e8bb4d014a09d77f97b4c15de1e24fb406aed6
font_01_sfnt_off00006965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6965 18184 bytes
SHA-256: c51aa8ed87b8ee8755a1ecd789814fb67703fc10c946440f5ae6e88abb0f8eda

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