Malicious PDF — malware analysis report

Static analysis result for SHA-256 16dfd002bb3b4540…

MALICIOUS

PDF

45.9 KB Created: 2021-06-11 08:47:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d289f5d98c06455766d24d3eed3e01ee SHA-1: 8ac128f89b481b2e2983751f2f7787a2d8898a92 SHA-256: 16dfd002bb3b4540e506222b692124c98daf1e328746a3235e366b185b4530af
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, disguised as game hacks and free generator lures. The primary malicious URL identified is https://netcdn.tw/app/431946152/roblox-assassin-knife-hack-spawner-game-hack. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an attempt to redirect the user to a malicious site, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/roblox-assassin-knife-hack-spawner-game-hack In PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-hack-peoples-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-hats-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/unlimited-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-windows-10-free-trial_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/murder-mystery-free-online-games-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/haktuts-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/spin-link_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/robloxbux-us-generator_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-skins-on-coin-master_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
stream_004_off000052cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52CF 27152 bytes
SHA-256: c62241dda08ae2f758ae2c4ed3408eece6ff2dd5db943183dc2bb43415240f1e
font_01_sfnt_off00008fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA6 18640 bytes
SHA-256: f37fed8229f213ade1749febb1ea2155ef03e0bb6b6769511131aea1502f45ba

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