Malicious PDF — malware analysis report

Static analysis result for SHA-256 670cf4cda1c9009a…

MALICIOUS

PDF

37.0 KB Created: 2021-05-21 15:50:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 877b3cf11a3af83132fc3b2c9d365248 SHA-1: 6b105643eff5d7b2a02722676380f9007c112816 SHA-256: 670cf4cda1c9009af0361ead1f9a072d4279b2fb71855bd85a75c9653789493e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, with one prominent link identified as a malicious redirector. The document body and heuristics indicate a lure for 'free spins' or 'hacks' for Coin Master, suggesting a phishing or scam attempt. The presence of embedded URLs and the nature of the lure point towards an attempt to redirect the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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-today-2021-game-hack In PDF document text
    • https://cleansui-home.com.tw/image/data/files/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-32-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/free-roblox-premium_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/how-to-get-free-spins-coin-master_GM406889139.pdfIn 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_off0000337a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x337A 24912 bytes
SHA-256: 5b9d4b3caeb9ec6a57fc333cb9e7879670eff4d6346886513b2154ae9d60c937
font_01_sfnt_off00006d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D11 19052 bytes
SHA-256: 51ec1fd699785aa8f843f12306ac352f9679003eb9b4544ea09afbac11be1d71

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