Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e8da51c6d568b9…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 00:14:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fee40d506acd558305807aa513879f01 SHA-1: 922c961fdb808368018689624baf8962d6febce4 SHA-256: c5e8da51c6d568b9dee58ff23f9939a8e09cba39eb7be02c544077f5e2207e4b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links and a call-to-action phrase, directing users to a known malicious redirector infrastructure. The primary lure is related to obtaining free Robux or game hacks, a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a malicious redirector workflow.

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-2021-easy-game-hack In PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-roblox-outfits-for-boys_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-email-rewards-link_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/lua-hack-client-roblox_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-shirt-hacker_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/minecraft-pe-free-download-android_GM479516143.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/actual-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/for-free-for-robloxcom-mobile4free24com_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-nike-roblox_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-ios-hack_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/xray-hack_GM479516143.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/red-kine-cheat-roblox_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/notoriety-hacks-pastebin-roblox_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-robux-roblox-logins-password_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_off00002f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F80 22152 bytes
SHA-256: 607fb615a4c29c81cbe2f72ac897506f5ded1a5f0f4f764a9839b2c9fae3a379
font_01_sfnt_off00006034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6034 19568 bytes
SHA-256: 54573245d87bf425d09f38ae69d600f60ea89f6a8aa7cff0a6b46d42a5179ab9

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