Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa5e0f555b3282d…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 21:48:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6aa31fb870314088955117a12e15dd22 SHA-1: 2898f393543d61500974a5f90371c83110ba6167 SHA-256: 8fa5e0f555b3282d95bd9d8b58c0b1bd4f871ab5aa57c872a39c0a2a77e4c90d
160 Risk Score

Malware Insights

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

The PDF contains multiple links to a redirector hosted on 'netcdn.tw', which is flagged as malicious infrastructure. The document body and embedded URLs suggest a lure related to game hacks and 'free Robux', indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/431946152/what-is-robux-game-hack In PDF document text
    • https://lib.insan-unggul.ac.id/repository/how-to-hack-out-of-bank-roblox_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/roblox-hack-client-pc-download-aimbot_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/roblox-free-50-robux_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/do-do-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/cheat-engine-not-working-in-roblox_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/robux-free-codes-legit_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/hacks-para-juegos-de-roblox_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-coins-for-flip-master_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/how-to-block-someone-on-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-cheats-without-verification_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/changelog--free-codes-https-devforumrobloxcom-t-infinityrpgc_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-roblox-gift-card-26-11-2021_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-hack-app-ios_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/bb-hackes-for-roblox-ro-boxing_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-hack-generator-tool_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/robux-game-com_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-hack-without-verification-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/take-me-to-get-free-robux_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_off00002fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FAE 21964 bytes
SHA-256: 0fa391e2521ff46720a190a07e9a9c5d4de42fbce4f25bf0db81a3f92f6440af
font_01_sfnt_off0000605e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x605E 19020 bytes
SHA-256: 1f095fbaada2d771d7bc4ba623b582b34f8145ca62f541118b0a68bd13fce424

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