Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea47998b4cddb0a…

MALICIOUS

PDF

45.8 KB Created: 2021-06-08 21:11:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7f01b0c56b51cbe218c4fa1cf082f20b SHA-1: 4584f04f15ba6f17fe3d8f5c3865573694fed402 SHA-256: fea47998b4cddb0ab9acdcf1611e02be68faa969d5cad7105c6f126ad222a4d4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains links to known malicious redirectors, specifically promoting 'game hacks' and 'generators' to lure users. The primary link, https://netcdn.tw/app/431946152/hacks-to-get-robux-in-tower-of-hell-may-2021-game-hack, is identified as a malicious redirector. This suggests the document's purpose is to facilitate the download of a second-stage payload through social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/hacks-to-get-robux-in-tower-of-hell-may-2021-game-hack In PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-hack-without-verification-code-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-script-executor-free_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/is-tiktok-free-to-use_GM835599320.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-draw-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/girl-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-cracked-apk-free-download_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-skins-boy-free_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
stream_004_off000051a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A7 25604 bytes
SHA-256: e65c6bcea7ed729a460f4d0f947f61b5c4041b1745df439b2a1c7a14bb3d4cc1
font_01_sfnt_off00008d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2B 19368 bytes
SHA-256: 982784438d68ed2190511e8f14e7d3de779a379b9b479e31b208fdd42259e501

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