Malicious PDF — malware analysis report

Static analysis result for SHA-256 10cde595aec08698…

MALICIOUS

PDF

32.2 KB Created: 2021-07-19 01:25:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 45dd881604c249a0b3f26daf3f3e27fc SHA-1: f82c70aa8ca38e7e80d047bef782e487abbcac77 SHA-256: 10cde595aec086985b34176a788cab276908df7f1d8da55818f1ff524777043e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and domains, masquerading as game hacks or free downloads. The document body explicitly mentions 'Coin Master Free Spins 2021' and provides a call to action to access a generator, indicating a phishing or scam attempt. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9452

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 http://netcdn.tw/app/406889139/coin-master-free-spins-2021-game-hack In PDF document text
    • http://kcpb51.ru/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://kcpb51.ru/images/minecraft-free-version_GM479516143.pdfIn PDF document text
    • http://kcpb51.ru/images/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://kcpb51.ru/images/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://kcpb51.ru/images/how-to-get-minecraft-dungeons-for-free_GM479516143.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_off00002883.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2883 22924 bytes
SHA-256: 4fab6990ebbefa77658625c7fae70fc7b17d995dd03e0b33b37ddabb9e7a8b85
font_01_sfnt_off00005bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BEE 18288 bytes
SHA-256: 9f7609fba99e53c6baa99bb04d1c7e3f9b7167131c1520eb2a413cdab4a14871

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