Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5c30dccab6b4b2…

MALICIOUS

PDF

35.5 KB Created: 2021-06-18 15:20:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8b389f7eb87f4aa1d61820da45b0e0dc SHA-1: b2552f8ff7e5ad7eacbd4951f3875650d12d5f7d SHA-256: df5c30dccab6b4b20507b2d6cf0cae653be06414e373a776bd2fcd085039a15e
142 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a 'doc body' that explicitly mentions 'Roblox Robux Hack' and 'Coin Master Free Link', indicating a lure for potentially fraudulent downloads or credential harvesting. The presence of a 'download button' heuristic and brand impersonation (Apple) further supports a phishing or scamming attack pattern. While no scripts were directly extracted, the PDF structure and embedded links suggest it may exploit vulnerabilities or redirect to malicious sites, potentially leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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: http://netcdn.co/app/431946152/roblox-robux-hack-with-cheat-engine-6.4-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
  • 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.co/app/431946152/roblox-robux-hack-with-cheat-engine-6.4-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id//repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-in-less-than-1-minute_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-spins-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/is-it-possible-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-tiktok-likes-and-followers_GM835599320.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-free-spins-link-may-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-console-inspect-command-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-unlimited-spins-game-download_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-robux-hack-script-jquery_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spins-link-download-free_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-cheats-2021_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
font_00_sfnt_off000031df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31DF 22412 bytes
SHA-256: 1cc93818e62750e975bddd5baa2d6cc168de8306d4cfdbd3f96e61e9403448de
font_01_sfnt_off000063f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F7 19680 bytes
SHA-256: 0eda43ec64a4c7db37757faa84dd685344c0e67d266c26171bc36b230d7a3aa8

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