Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5ecf6c3d92090d…

MALICIOUS

PDF

44.4 KB Created: 2021-05-12 15:35:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 78be8f781d1ff876c3bae47047de3718 SHA-1: 72ddfefc773dc501a3398d2d4ff56e4474d69de0 SHA-256: 2d5ecf6c3d92090d044b7cae500e9b4438e780ed27cac7cc94e2e90cc2082146
202 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure and a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/you-promised-my-son-free-robux-game-hack PDF link annotation
    • http://lib.icbc-indonesia.org/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-hack-no-survey-2021_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/blox-best-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/https-rbx-place-rewards_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_off00004adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4ADF 26812 bytes
SHA-256: c52569ccdd85a951494334ecb61056336eb49b029f2920df14cd2398045595a4
font_01_sfnt_off00008884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8884 19260 bytes
SHA-256: 86e86c6d1a3146e1f407edd8c9cf68c56566e4a3a2a05930f639aef478547eb3

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