Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31992fbc3679c91…

MALICIOUS

PDF

37.7 KB Created: 2021-05-20 21:40:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b89c0dc06c54982ecca9a599a1da6d0e SHA-1: 42cc5269f3ae4189d15db5fbb9adf500451e21e6 SHA-256: f31992fbc3679c91f0b2cac34114d4893676646e29c76f387cc525fe3d3fd80c
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and generators, including a fake CAPTCHA prompt. The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-roblox-clothes-game-hack. While no scripts were extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at tricking users into executing further malicious content or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/free-roblox-clothes-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-free-online-unblocked_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-online-generator_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-no-verification-2021-android_GM431946152.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_off00003211.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3211 28648 bytes
SHA-256: bcdfe3e41abd75a505e7ed3b3e494e9308e1d6a1fd5e05381067aacd1266cfc6
font_01_sfnt_off0000728d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x728D 18216 bytes
SHA-256: e50810547e3c30daf02b15d5ac458835679762fa1a68c20d7c153a389bd1cc19

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