Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f09127386a93abc…

MALICIOUS

PDF

37.6 KB Created: 2021-05-21 05:41:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b6bd783a07f0415dc15ffb69fd24e715 SHA-1: 30f24dabbe9ad0f0a230fdc2adb7881b0f0f13c3 SHA-256: 5f09127386a93abc647fdbd9f2af64c1838fc0ff4673e55ee499d4c01ee9a29d
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirector infrastructure, specifically advertising 'free Robux' and 'game hacks'. The ML classifier also flagged this PDF as malicious. The document body and embedded links suggest a lure to a scam or potentially a phishing site.

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.
  • 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
  • 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/codes-to-get-free-robux-game-hack In PDF document text
    • https://learning.mtsn1pnd.sch.id/__statics/gudangsoal/files/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • https://learning.mtsn1pnd.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://learning.mtsn1pnd.sch.id/__statics/gudangsoal/files/minecraft-free-version_GM479516143.pdfIn PDF document text
    • https://learning.mtsn1pnd.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • https://learning.mtsn1pnd.sch.id/__statics/gudangsoal/files/free-robux-no-verification-needed_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
font_00_sfnt_off000031b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31B6 27852 bytes
SHA-256: 89a2b6571cbae09a9d667e953726e5bb90322397affbcf6ae274d8d34f15d674
font_01_sfnt_off000071dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71DC 18292 bytes
SHA-256: c4e16f213ba515826b0fc8bd2adb9a42249615e2a7fe5232f5ebe2d4ec6172c1

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