Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9f0f8d14cd50a7…

MALICIOUS

PDF

33.1 KB Created: 2021-07-06 09:07:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cb8df077be0c758343da1e72f831246a SHA-1: 4921b91f7d006db4b69842682cf36fd2a0143b7b SHA-256: 0e9f0f8d14cd50a777c9323e44730bd9d4140e2a13a42b0ce198c87bfe619b2b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, disguised as offers for free Robux and game hacks. The primary lure URL is http://netcdn.tw/app/431946152/free-robux-accounts-2021-game-hack, which likely serves as a gateway to further malicious content or phishing pages. No scripts were extracted, but the embedded URLs and the nature of the lure strongly suggest a social engineering attack aimed at tricking users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/free-robux-accounts-2021-game-hack In PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-33-hack-version-download_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/roblox-project-pokemon-hack-vermillion_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-how-to-get-free-pet-food_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/roblox-free-recompense_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-old-roblox-accounts-2021-pastebin_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/case-clicker-hacked-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/comment-hacker-roblox-jailbreak-youtube_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/roblox-counter-blox-hack-aimbot_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-get-free-legit-working-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/roblox-music-script-hack_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_off00002ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AE2 22104 bytes
SHA-256: fe683126ef469758f665e8d2157948bbda266d47478df3fecaeec3b6cee6cdd7
font_01_sfnt_off00005bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF5 19224 bytes
SHA-256: 156e97e656f4bb783494abd7ae53ecfa8912a458841a7d4a142d29130362a46d

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