Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77cb14ee8181b80…

MALICIOUS

PDF

37.0 KB Created: 2021-05-14 23:11:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 57d0a02336c06fac0154af1a55bb6af0 SHA-1: 5bdd953e1038db4c47aca5c68bab3686a88fb94f SHA-256: b77cb14ee8181b804f668612cce988298ea2e2a0303e18e3c866864a9a501e5d
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, disguised with a "Coin Master Hack" lure. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest it's designed to redirect users to malicious sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9313

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-hack-online-2021-game-hack In PDF document text
    • http://kaleasm.org/images/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://kaleasm.org/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://kaleasm.org/images/i-want-free-robux_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_off000036a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36A7 24936 bytes
SHA-256: 6d1bfd33c4ba868dcbe310f2f81c31bd6627de9ff0524f9fad105d48b7bd6afb
font_01_sfnt_off00006f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3E 18192 bytes
SHA-256: ec8cb6d56d0df2adcfe0c2b29b17454d13f1615f522836c6e7b582aab5d03dc6

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