Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f69f94a223d9e47…

MALICIOUS

PDF

34.8 KB Created: 2021-07-08 13:41:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f66912072afb26e05f255c257f3ce7f6 SHA-1: 7019238256f2f0043e48d51f2c7b083256b75760 SHA-256: 4f69f94a223d9e471ffb3a5e127bb486dd9e94e2e061189e3103440c11ffe2ed
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game currency (Robux) for Roblox, a popular online game. It contains multiple embedded URLs, including a primary malicious redirector at http://netcdn.tw/app/431946152/roblox-help-free-robux-game-hack, which is known to host malicious content. The document's structure and content strongly suggest it is designed to trick users into visiting these links, likely leading to further malware downloads or phishing attempts. No scripts were extracted, but the PDF's nature and the malicious redirector indicate a high likelihood of a phishing or malware distribution campaign.

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/roblox-help-free-robux-game-hack In PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-free-bundles_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/como-hackear-roblox-en-celular_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-robux-in-obby_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/cheat-engine-roblox-youtube_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-robux-generator-for-xbox-one_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/noob-invasion-roblox-get-free-exp_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-robux-roblox-bots_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-do-you-get-a-free-dominus-in-roblox_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/download-roblox-free-full-version_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-anime-roblox-shirt_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/login-roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-to-get-free-robux-without-hacking-2021_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/abd-roblox_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-how-to-get-free-robux-without-verification_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_off000030d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D4 22756 bytes
SHA-256: 7e76060102c3f34b25ae557be77686c94a83af0c71d219a818cdb85b26776c2a
font_01_sfnt_off00006373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6373 18968 bytes
SHA-256: e6d3133e218776b7d87035f377c26f4245cc7a54287827524eb781a63c565006

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