Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4ee4dae31aeb88…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 17:16:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b1a30e7bed0a22bee0e34c53dc44c52c SHA-1: 975989b987bde6ceecab66f04cbd0d969b1f0fd0 SHA-256: 5a4ee4dae31aeb8844c8dd4576f5686329f3c28fc93b350e32577e65855e5a8b
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a "free Robux giveaway" and "game hack", directing users to a known malicious redirector infrastructure. The document's structure is malformed, suggesting an attempt to exploit vulnerabilities. The embedded URLs and document body content strongly indicate a phishing or scam attempt designed to trick users into visiting malicious 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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-giveaway-2021-game-hack In PDF document text
    • http://library.gkigadingserpong.org/repository/get-robux-today_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-spider-man-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-minecraft-thumbnails_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-pets-paradise-hack-script_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-today-39_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-code-robloxcom_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/100-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-holiday-crown-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/game-hunters-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/icebreaker-roblox-hacks_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_off00002f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F86 22464 bytes
SHA-256: 9e056a55548b02616d43affca2f3f787dca36f0d8aeb8ac13f0111fc73a487d9
font_01_sfnt_off00006129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6129 19696 bytes
SHA-256: 376ecfd0b50c6b4043ec172d166a396d199e275a9754910f301b7773317d9ce3

Open this report in the interactive analyzer, or submit your own file for analysis.