Malicious PDF — malware analysis report

Static analysis result for SHA-256 121da2efbcd8afa3…

MALICIOUS

PDF

44.7 KB Created: 2021-06-09 03:57:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 274401dc867f9250fe5fd2e0d6e8f7ea SHA-1: 0f1a50ebc5aff013d9dd46102e59207fb63076f1 SHA-256: 121da2efbcd8afa32e39fcfc830d579297990f69cea6421906314eb18b61f613
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'free spins' to lure victims. The ML classifier also strongly indicated maliciousness. The embedded links likely lead to a second-stage download or a phishing page, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/stella-beta-roblox-hack-download-game-hack In PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-ftw_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-daily-fb-champion_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/minecraft-mod-menu_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spin-app-iphone_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/no-scam-free-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
stream_004_off00004ceb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CEB 26900 bytes
SHA-256: b720d8260d06b9cbbe5fd12967ae85369599bd91f42b8c980eb7c18327465d7e
font_01_sfnt_off00008a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A58 18792 bytes
SHA-256: 12bb3cd41f58f342651646f471021bba82cd13010fe222ef9669902196b03057

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