Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cbabb255b97517…

MALICIOUS

PDF

43.9 KB Created: 2021-06-03 09:28:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 230d67d47d31efc2c44fd96010ddcd94 SHA-1: 1c09252f6c9a784221bad0bdb15abd7bb4efde28 SHA-256: 99cbabb255b97517c2282bc0f913fa7080fb6490a4632790d6da19a04128380a
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

The PDF contains multiple links impersonating Microsoft and offering free Robux, a common lure for credential phishing or malware downloads. The primary malicious link, https://netcdn.online/app/431946152/get-me-robux-for-free-game-hack, is flagged as a known malicious redirector. While no scripts were extracted, the PDF structure and embedded links strongly suggest an attempt to exploit user interest in gaming and virtual currency to compromise their accounts or systems.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/get-me-robux-for-free-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.online/app/431946152/get-me-robux-for-free-game-hack In PDF document text
    • https://www.solararabialtd.com/uploaded_files/userfiles/files/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://www.solararabialtd.com/uploaded_files/userfiles/files/coin-master-spin-rewards_GM406889139.pdfIn PDF document text
    • https://www.solararabialtd.com/uploaded_files/userfiles/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.solararabialtd.com/uploaded_files/userfiles/files/roblox-studio-free-download_GM431946152.pdfIn PDF document text
    • https://www.solararabialtd.com/uploaded_files/userfiles/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.solararabialtd.com/uploaded_files/userfiles/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.solararabialtd.com/uploaded_files/userfiles/files/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://www.solararabialtd.com/uploaded_files/userfiles/files/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://www.solararabialtd.com/uploaded_files/userfiles/files/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • https://www.solararabialtd.com/uploaded_files/userfiles/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.solararabialtd.com/uploaded_files/userfiles/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.solararabialtd.com/uploaded_files/userfiles/files/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • https://www.solararabialtd.com/uploaded_files/userfiles/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://www.solararabialtd.com/uploaded_files/userfiles/files/free-group-with-over-1k-members-roblox_GM431946152.pdfIn PDF document text
    • https://www.solararabialtd.com/uploaded_files/userfiles/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://www.solararabialtd.com/uploaded_files/userfiles/files/coin-master-new-cards-hack_GM406889139.pdfIn PDF document text
    • https://www.solararabialtd.com/uploaded_files/userfiles/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.solararabialtd.com/uploaded_files/userfiles/files/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • https://www.solararabialtd.com/uploaded_files/userfiles/files/robux-2021_GM431946152.pdfIn PDF document text
    • https://www.solararabialtd.com/uploaded_files/userfiles/files/free-coin-coin-master_GM406889139.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
stream_004_off00004daf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DAF 26024 bytes
SHA-256: 514e1cb6943dcda7e0e186adccd664c38be55f74a8face10cc2699ceb709aabf
font_01_sfnt_off000088af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88AF 18312 bytes
SHA-256: 932e048767bb22e6267a54c454926b1d6572868c8ffb63cd4dd0c91a684054b1