Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7755f44ee6d107b…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 20:57:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f8e08d10e3bd4f40267d1db00cef4b8a SHA-1: acc54f0b2eeffc1c4ea172f97e5d6797a9925833 SHA-256: a7755f44ee6d107b1e32d1bb6df7d94b7929cc04e700472525516cf73de8d231
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to 'netcdn.tw', which is flagged as a malicious redirector. The document body and heuristics indicate a lure for free game currency (Robux) or hacks, designed to trick users into clicking the malicious link. This likely leads to a phishing page or malware download.

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/how-to-get-free-robux-on-roblox-game-hack In PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-free-spin-2912-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-download-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/roblox-escape-mcdonalds-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-roblox-card-codes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-abs-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-get-codes-free-for-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-you-hack-on-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-hack-ios-without-verification_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/minecraft-116-1-download_GM479516143.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/roblox-hack-eploit-jailbreak_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/roblox-free-robux-hack-no-password_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/hack-coin-master-xyz_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_off00002f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F9D 22636 bytes
SHA-256: e6e843924d61c2efe7f742530f88bdeae93bfe3422edec215336eeb73cf6ab1d
font_01_sfnt_off00006232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6232 19056 bytes
SHA-256: 22e79bf31db193f266ad8ef0f47d1a9e736b831aec58415b80c9b2f57893c59e

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