Malicious PDF — malware analysis report

Static analysis result for SHA-256 710c877f04bc9d9b…

MALICIOUS

PDF

35.4 KB Created: 2021-07-05 20:38:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d416d90276825141c5f0d41876657f59 SHA-1: cab61ce722cbe23623fe0045198045b2dc658861 SHA-256: 710c877f04bc9d9b094e3853690c96f7cbdc47b15b2629e25ea138696a5bf428
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector at http://netcdn.tw/app/431946152/real-roblox-game-hack, disguised as a 'free generator / game hack'. The document body and heuristics indicate a lure for game-related cheats or currency, a common tactic for distributing malware or phishing for credentials. No scripts were extracted, but the presence of multiple malicious links suggests a high likelihood of redirection to a malicious site.

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/real-roblox-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/links-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/dll-files-hack-for-roblox-vehicle-simulator-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-geometry-dash-roblox-odes_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-hack-roblox-mad-games_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-jailbreak-cheats-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-hack-roblox-pc-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/is-minecraft-free-on-xbox_GM479516143.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_002_off000032a0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32A0 23600 bytes
SHA-256: 083373569bbf2db9506da6f295c46550110e90e426d40d31989e081eb3f446c3
font_01_sfnt_off00006708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6708 18484 bytes
SHA-256: 7f0f55fb7efe68b4890159f191db407b63f8f65986d021ee8cd072538b6ccf6b

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