Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e9a85bac498ef4…

MALICIOUS

PDF

33.4 KB Created: 2021-07-05 15:35:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5322006f0185c27574beb16443c2f979 SHA-1: 6ce5e7d416233d066053fe26cfa2df3502c0e9c6 SHA-256: c4e9a85bac498ef4f2809dec794ed41a20956d8e7c35020764a013720140faf4
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including one to a known malicious redirector, designed to lure users into downloading potentially harmful content related to games and hacks. The document body and embedded links suggest a phishing or scam attempt, likely to deliver a second-stage payload or lead users to credential harvesting pages. No scripts were extracted, but the PDF structure and link farm indicate a malicious intent to redirect users to untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-summer-grl-free-roblox-game-hack In PDF document text
    • https://elibrary.ikhac.ac.id/repository/is-pokemon-go-community-day-free_GM1094591345.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-to-get-100-robux-on-roblox-free-2021_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-cheating-real-no-more-playing_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-free-robux-hack-no-offers_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/gainbloxgg-robux-free_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-free-shirts-and-pants-catalog_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/can-i-make-a-costum-charecter-is-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-roblox-rigs_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-robux-downlod_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/team-chqnger-hack-roblox_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-apk_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/working-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-mod-apk-hack_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/apk-hack-game-roblox_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/email-scammer-claiming-to-be-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-to-hack-someones-account-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-ballon-simolator-gem-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_off00002db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DB4 21668 bytes
SHA-256: 7010d6a98184236451e30cc0eea60adb39ae228a7a1fe18c8391c1bd40373b56
font_01_sfnt_off00005d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D84 19052 bytes
SHA-256: ba8ea5eb11896784ea5cf6d9d4ee5c375b82dddf888251aa4c217bc72e7506a5

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