Malicious PDF — malware analysis report

Static analysis result for SHA-256 215ccc8eead12508…

MALICIOUS

PDF

43.2 KB Created: 2021-05-12 00:09:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: db748279d858557d16b702a1fc242e65 SHA-1: 04796881a18788b521e263c9d1b5a54c84a51e9e SHA-256: 215ccc8eead12508b87a4d7935116425e468708e000eb2f926d7941ed21038ce
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to what appears to be a link farm, with a primary redirector pointing to a 'free Robux' lure. The presence of a fake CAPTCHA heuristic suggests an attempt to trick the user into interacting further, potentially leading to exploit execution or further malicious downloads. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.xyz/app/431946152/free-robux-giveaway-live-game-hack In PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-spins-coin-master-2021-glitch_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-apk-hack-35-8_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/www-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-come_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-hack-game-download-mod-apk_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-daily-free-spins-link-2021_GM406889139.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_off00004815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4815 27048 bytes
SHA-256: 75a86ff787aeb8d17bfc7a01fb864fb0d46cc9c9f39a37642cda16bb49f95282
font_01_sfnt_off000084f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84F9 18820 bytes
SHA-256: 3db94d24ba3abe2bdb9d310b65f8480e65e9005ffe127367b6d2ef8ae08c9d7b

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