Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f9cdad1bbf247a…

MALICIOUS

PDF

33.8 KB Created: 2021-07-05 22:01:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 83dd8ea812568e94e60cfef73f4bf76e SHA-1: 124bd85396c736aac09484c47aaa3b8d0eff6311 SHA-256: d8f9cdad1bbf247a83d0a1dd49a2bb3d281d4f5a1f41e62f81bd5e42e93439b1
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on what appears to be a 'free generator' or 'game hack'. The primary link redirects to known malicious infrastructure, suggesting a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a malicious redirector workflow, likely intended to lead the user to a site that exploits them or attempts further credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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.
  • 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/free-premium-roblox-game-hack In PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/roblox-private-server-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/cool-free-roblox-hats_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/roblox-admin-hack-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/how-to-hack-on-roblox-mac_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/cheats-for-roblox-prison-life-20_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/pokemon-go-free-coins-2021_GM1094591345.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/www-roblox-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/free-cool-clothes-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/roblox-how-to-get-more-fps-hack_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/free-adidas-clothes-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/como-hackear-a-jugadores-de-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/flee-the-facility-hack-roblox_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_off00002f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F94 21584 bytes
SHA-256: 516ef3b666a3800d9780a5b2930e87c3f2be09028a61c909ef535d3e5f5a2903
font_01_sfnt_off00005e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E96 19324 bytes
SHA-256: bffeb858734709d9e626e1cf7762beb37c79d024cf91ee5740b88d17242ac5df

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