Malicious PDF — malware analysis report

Static analysis result for SHA-256 43befcc4fdced849…

MALICIOUS

PDF

34.2 KB Created: 2021-07-03 19:32:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4ff1078170e4a9c24e24e4e624300709 SHA-1: 86f5e58b0aacf955051418aca897a0653118f0f0 SHA-256: 43befcc4fdced8496a4bf476716ab955107617c9fb773855b28a390274ace874
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 a 'free generator / game hack' for Roblox. The document body and embedded URLs strongly suggest a lure for users seeking in-game currency or cheats, which is a common social engineering tactic. The ML classifier also flagged this PDF with high confidence, indicating malicious intent.

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-group-free-robux-game-hack In PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/red-line-30-roblox-hack_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/hacks-for-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-robux-glitch_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-roblox-gift-cards-2021_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-star-codes-roblox_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/jailbreak-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/games-that-give-you-free-stuff-roblox_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/roblox-cheats-no-human-verification_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/robloxcatalog-free-robux_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/instalar-hacks-de-comandos-de-admin-para-roblox_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/coin-master-apk-hack-358_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/hack-roblox-get-free-tix-robux_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_off00002eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB7 22492 bytes
SHA-256: e1411c7c2523f4fdeac9782afa64046b1f88c5dafb87a94acb36d601e6100697
font_01_sfnt_off000060d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D9 18968 bytes
SHA-256: f48b2ae17e84399e3a6b420fde02f8f729f2240ca84fd7cf9c0f4aab3f14a6ff

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