Malicious PDF — malware analysis report

Static analysis result for SHA-256 6233c276f576f938…

MALICIOUS

PDF

32.6 KB Created: 2021-07-05 02:56:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b06435900aabe3ca2d61d07492a6ea43 SHA-1: 2eeb80ba688e68292b412f6f075dab0deb0e24a5 SHA-256: 6233c276f576f938556d9b7697f1026f9cbe8ddd7cb4609240927319f362535d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically targeting users with a 'free generator / game hack' lure. The document body reinforces this by displaying a call to action to access a 'ROBUX GENERATOR'. The embedded URL http://netcdn.tw/app/431946152/how-to-earn-free-robux-game-hack is identified as malicious infrastructure, indicating a likely phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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 http://netcdn.tw/app/431946152/how-to-earn-free-robux-game-hack In PDF document text
    • http://lib.mbp.ac.id/repository/free-minecraft-skins-java_GM479516143.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-roblox-toys_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/roblox-studio-free-download_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/confiscation-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/is-roblox-hacked_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/minecraft-116-free_GM479516143.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/minecraft-thumbnail-maker-free_GM479516143.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/kupcake-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/downloadable-roblox-hacks-on-pc_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-facebook-free-spins_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_off000028d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28D5 22648 bytes
SHA-256: 85b3f94a42f3e5916f9970d719da7f056b5ad0af59b3773d10ab14c02f45c756
font_01_sfnt_off00005b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B3A 18880 bytes
SHA-256: a522bee010909c1dfdd5b814bfadf8c7715ebc59745b399d37c475b37c42e617