Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37725667bc48ae0…

MALICIOUS

PDF

35.7 KB Created: 2021-05-22 15:07:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: be87b58d538698ced1cbfd30ed563cd3 SHA-1: 8c3e21d0cbd4502fab6b60f48a770e756a9dd93e SHA-256: d37725667bc48ae000f1bd1ec1cf13344eaf5dc955c243298ef4905c4404c617
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising a 'Coin Master Daily Free Spins Link' and a 'generator/hack'. The document body text and embedded heuristics confirm the lure is to trick users into clicking these links, likely to download a second-stage payload. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0718

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-daily-free-spins-link-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002e67.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E67 29972 bytes
SHA-256: 0502737fc38a50364e39ef81a1355950a0fe2b092826cbc669910272ecff09a2
font_01_sfnt_off00006a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A21 18476 bytes
SHA-256: dd1e9edcae6782c480dff53724a1580fadec54e6656b8ddfb273bcd699f2c343

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