Malicious PDF — malware analysis report

Static analysis result for SHA-256 414a0eb7a9ebf260…

MALICIOUS

PDF

31.7 KB Created: 2021-07-19 08:09:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8ff2731263a2849da2c4d52d967deb8f SHA-1: 140b439e8b508bf1ff54fb420684d4b2504e4c27 SHA-256: 414a0eb7a9ebf260077152b502dbbe3cb4094dcfd5a791c2d01be9150345b4bb
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded URLs and a document body that attempts to lure the user into clicking a link for 'Free Robux'. The primary malicious URL identified is http://netcdn.tw/app/431946152/free-robux-without-downloading-apps-game-hack, which is likely intended to deliver a secondary payload or lead to a phishing site. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8903

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/431946152/free-robux-without-downloading-apps-game-hack PDF link annotation
    • https://balibanknews.com/new/public/ckfinder/userfiles/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • https://balibanknews.com/new/public/ckfinder/userfiles/files/minecraft-pc-free_GM479516143.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
font_00_sfnt_off00002451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2451 21972 bytes
SHA-256: 157098403c97c9a3f547196a83f1c10e0923cc719a0f58dee4d15b4750ed4dfb
font_01_sfnt_off000054c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54C5 20060 bytes
SHA-256: a8fbfe7f7d9ee5c6d1e0a9d54f6a8f2618b4750cae31927e831424281ea5393b

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