Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d154310b15bd4b4…

MALICIOUS

PDF

38.8 KB Created: 2021-05-23 00:20:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bff9b964087a0778a36790d21dbc54d7 SHA-1: 289d10fce71dbd9d7dde7da2cc0b586b97b9211e SHA-256: 7d154310b15bd4b4de0f4a3e79481ab9b710663b2db2b90762e0f553db567dfc
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/835599320/free-tiktok-fans-no-verification-game-hack PDF link annotation
    • http://maslabaou.com/images/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://maslabaou.com/images/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://maslabaou.com/images/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • http://maslabaou.com/images/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://maslabaou.com/images/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003081.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3081 26808 bytes
SHA-256: ab113064873aa3feadada10db875e4cc85e1b3deb4ad60db44cc6dc0b0082df7
font_01_sfnt_off00006d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7A 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00007760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7760 17816 bytes
SHA-256: db30cff21771a834018d301e3e15668d4f696dd14c251b75c79f93eed26cd5f9

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