Malicious PDF — malware analysis report

Static analysis result for SHA-256 b731498fa99ce19f…

MALICIOUS

PDF

47.1 KB Created: 2021-06-03 09:36:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fdec53caa9886944cfd7a4a088b52f8d SHA-1: 011aabef07f98423340ba35f0778ee4a1b7849fc SHA-256: b731498fa99ce19f40f1eaff902178807d8d074e91fbb5f0f1c3a82a9f53347b
260 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to malicious websites, masquerading as game hacks and generators. It also includes a lure for remote support tools, suggesting an attempt to gain unauthorized access. The ML classifier strongly indicated maliciousness, and the presence of numerous SEO-optimized PDF links points to a link farm designed to attract unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.online/app/479516143/free-online-games-like-minecraft-game-hack In PDF document text
    • http://perpus.i2s-learning.com/repository/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-hack-coin-master-with-game-guardian_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-links-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-login-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
stream_004_off0000538a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x538A 30888 bytes
SHA-256: 432cbccb2d99dc13cc94dca4283aa474e8752e3480c876d4560fb19ff6e38322
font_01_sfnt_off0000967c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x967C 18072 bytes
SHA-256: 246b849e2f56f6dfbc2c344cbb2402d5c34ee1f8458d292b794ed9a5a308c484

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