Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8f8ba881dd14e4…

MALICIOUS

PDF

36.8 KB Created: 2021-05-19 09:00:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dd040acb6f8a7c830f5e61a8734d3339 SHA-1: 23688813d2290c9e8bfd9cd7e6ec01ddeb1d3bb6 SHA-256: 7f8f8ba881dd14e47a527db5878c78ba87ad687570039e2a4fe6299e8a197f2c
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links and text explicitly promoting a "Coin Master Hack 2021" generator, which is a common lure for phishing and malware distribution. The primary link directs to known malicious redirector infrastructure, indicating a high likelihood of further malicious activity. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a social engineering attack aimed at tricking users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0312

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-2021-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_off00003521.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3521 25268 bytes
SHA-256: 0762fa1a8de71e195b816ef916208bc89d7687b6745bbe9a8f58f95664cbb755
font_01_sfnt_off00006ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ECC 18116 bytes
SHA-256: 17974cef81917e5ef69542194afa433aff210173cc902887fbc2b56a9328dd03

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