Malicious PDF — malware analysis report

Static analysis result for SHA-256 a064a996009175c6…

MALICIOUS

PDF

39.7 KB Created: 2021-05-21 03:11:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4da4814715ff9e9227be226cf54d31ab SHA-1: 94f31a0a924a42483883d7a70ed6dbd44bc7b89b SHA-256: a064a996009175c68880ebbcad48d4704b75611c52ef95b5a16290aa9b8a2acc
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure for "Free Robux" and "game hack" generators, directing users to a suspicious URL. The presence of a fake CAPTCHA prompt further suggests an attempt to trick users into interacting with malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8068

Heuristics 6

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/431946152/free-robux-for-kids-no-verification-game-hack PDF link annotation
    • https://elearningmas.alhidayahwanti.sch.id/__statics/gudangsoal/files/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • https://elearningmas.alhidayahwanti.sch.id/__statics/gudangsoal/files/coin-master-redeem-code-free_GM406889139.pdfIn PDF document text
    • https://elearningmas.alhidayahwanti.sch.id/__statics/gudangsoal/files/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://elearningmas.alhidayahwanti.sch.id/__statics/gudangsoal/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elearningmas.alhidayahwanti.sch.id/__statics/gudangsoal/files/minecraft-free-android_GM479516143.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_off000033d0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33D0 24328 bytes
SHA-256: 4825b568b8a1d17c41491047281a01a2321ee0502e970f95f3b115426e64a5a9
font_01_sfnt_off00006b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B82 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00007829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7829 18776 bytes
SHA-256: abcd165e4b695e85902e5e0162dd8c883b494cae8faf27dbfb1f0dc34095f980

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