Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc73ad4bb78bdbe…

MALICIOUS

PDF

38.8 KB Created: 2021-05-20 14:15:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8c128772d185252a47888e7e87338c5f SHA-1: f8896865ba2f3477b4268791ab864f66b0a04c5e SHA-256: 9bc73ad4bb78bdbe3b9d84b946840a9d64d515cf68d4bf1dd94b9db1b687158e
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to external websites, masquerading as free game hacks and generators, which is a common lure for credential phishing or malware distribution. One of the primary links, 'https://netcdn.xyz/app/431946152/free-roblox-cards-pin-number-game-hack', is flagged as a malicious redirector and impersonates the Microsoft brand. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit vulnerabilities or trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/free-roblox-cards-pin-number-game-hack.
  • 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-cards-pin-number-game-hack In PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/how-to-get-minecoins-in-minecraft-for-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_off000035c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35C7 28192 bytes
SHA-256: d7938c143a0d5ac5690938ad1f87fb31ebdeb7fa92b8190ed70e1a3896867aeb
font_01_sfnt_off00007462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7462 19024 bytes
SHA-256: d202742233b17ada8e60ef392bbe1d59108b00a04bd9cee781b4229daa03d739

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