Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6d0580af6ecc34…

MALICIOUS

PDF

34.8 KB Created: 2021-07-06 17:50:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d04dc853fac754befdb2428650a643e1 SHA-1: 69e886b5033d35b57cd1697ae097129dd8f2cc20 SHA-256: ca6d0580af6ecc347454c45c953e1cece653d22a1f655866af7a559ddbb4349d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free Robux and game hacks to entice users. It contains numerous links to redirectors and a link farm, including the malicious URL http://netcdn.tw/app/431946152/free-robux-survey-game-hack. The document body and heuristics indicate a social engineering tactic to drive traffic to potentially malicious sites, likely for ad fraud or further malware distribution.

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-robux-survey-game-hack In PDF document text
    • http://library.stembi.ac.id/repository/hacker-para-roblox-apocalypse-rising_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-how-to-get-the-circuit-breaker-for-free_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-bee-swarm-simulator-free-honey-generator_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-roblox-accounts-without-pin_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/cheat-roblox-retail-tycoon-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/pastebin-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/hacker-tool-for-roblox-download_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/hack-para-roblox-dragon-ball-z-rage_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-do-speed-hack-on-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-free-expoit-that-run-loadstring_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-promocode-roblox-november_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-do-you-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-get-free-robux-100-works-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-strucid-free-skin-code_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-to-use-roblox-ads_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-hack-money-in-any-roblox-game_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-inmages_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/nonsense-diamond-roblox-hacks-fangs_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-hack-stats_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_off000030c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30C0 22440 bytes
SHA-256: ef5603a87a8eb99b47f0a77278bcfedbffd868b66e71b1c9f42d8da3210c1497
font_01_sfnt_off000062e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62E4 19012 bytes
SHA-256: c0541a5d6200ab17734b4952abc6c0a8b533a715d99044a6ee13c1a52db76e39

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