Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1bcce4fa69641a…

MALICIOUS

PDF

35.8 KB Created: 2021-05-13 05:41:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f7bc37f6fb0d5b23f646c242cdbd07e8 SHA-1: 9047907004a7b3af0d28856d5d0dac3dcace921d SHA-256: 9d1bcce4fa69641a1ad3934ad4b44f13aeb9dd51dc4e54bf908159203718b124
190 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for 'Free Coin Master Coins' and a critical heuristic firing for a malicious redirector link. The embedded URL points to a site known for distributing malicious content, and the document body explicitly requests recovery secrets, indicating a phishing or scam attempt. No scripts were extracted, but the overall pattern suggests a phishing lure designed to trick users into revealing sensitive information or downloading further malware.

Machine Learning

  • Nyx PDF Classifier clean score 0.0265

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/get-free-coin-master-coins-game-hack In 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_off00003412.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3412 24848 bytes
SHA-256: f50b470dbc67b464415d7d851245f08dae72689671cfd5af0f28c59efeb1cc11
font_01_sfnt_off00006c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C7B 17712 bytes
SHA-256: 21945d37724c890dd621455a00f6108c8bb3199d41d839a53701429653b6b663

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