Malicious PDF — malware analysis report

Static analysis result for SHA-256 d479cf41b1aaa205…

MALICIOUS

PDF

34.1 KB Created: 2021-07-03 16:31:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: af662e8945cd1ebbc60eaf09697013b0 SHA-1: cc52d81ff25db1fbb5077f81e3ed78762e4b4665 SHA-256: d479cf41b1aaa20539dd9a7f0ebdf8ad7b8b582663bbd2dada3685c36acf34f6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for 'free Robux' and 'game hacks', which is a common social engineering tactic to trick users into clicking malicious links. The primary link identified, http://netcdn.tw/app/431946152/how-to-hack-and-get-free-robux-game-hack, is flagged as a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

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-hack-and-get-free-robux-game-hack In PDF document text
    • http://library.atim.ac.id/repository/earn-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/become-vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-how-to-get-free-gears_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/robux-gives-roblox-haks-free-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-do-you-get-robux-for-free-on-pc_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/como-tener-hack-para-matar-en-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/comment-avoir-un-wall-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-roblox-account-with-obc-lifetime-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/android-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-hack-deutsch-pc-weg-machen_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/hack-para-roblox-dansploit_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-lua-7-exploit-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-books_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-tiktok-followers-instantly_GM835599320.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_off00002e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E91 21972 bytes
SHA-256: 294aa58916038545fb3b9cf7b8632d52a99bcd40a6b7d423c68e905d7676cdd1
font_01_sfnt_off00005f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2C 19328 bytes
SHA-256: 38bb1ef0d1232593bc33faeb07ab7c9da97d5775ca686b5d0190a8681bcdbe68

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