Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f05dfdf345201b8…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 23:36:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5061aef735051512a17a60e5a4cf0ab7 SHA-1: 0c4450d97b4620831345b604f7ac35baabe517f4 SHA-256: 5f05dfdf345201b8eafb365b320c39d0c05a2513afb04a39f6718250fb35b944
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple links to known malicious redirectors, disguised as 'free generator' or 'game hack' lures. These links, such as http://netcdn.tw/app/479516143/how-to-make-a-minecraft-java-server-for-free-game-hack, are designed to lead users to potentially harmful websites. The presence of a visual download button further supports the deceptive nature of the document.

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/479516143/how-to-make-a-minecraft-java-server-for-free-game-hack In PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-pastebin-2021-javascript_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-on-roblox-computer_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/june-29-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-demonius-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-make-your-own-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/tous-les-script-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-hack-peoples_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/cheats-for-blodody-mary-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-2-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/join-this-roblox-group-for-free-robux-roblox-groups_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-only-enter-username_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-1-000-000_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-2021-october_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-obby_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_off000031f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31F3 22084 bytes
SHA-256: 49062cbc4b011d5e7a12bc3e55f509218ac5eb1350146c0c7f84cb9e076b8c3f
font_01_sfnt_off000062ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62CA 18612 bytes
SHA-256: 2f26ca485e3ce6424112dab4712afbcf54fdd6cef5a3ad3dfb86d4c140eb7654

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