Malicious PDF — malware analysis report

Static analysis result for SHA-256 8997a056a2eccfd9…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 21:31:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 589bc06d8998c8294f57ca96b0689556 SHA-1: a9f164bcbd3c4f862873df105fdd93f4c37d80e9 SHA-256: 8997a056a2eccfd983e54917e2482676a1fd86c5d8949ec248737e407edef198
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, including a known malicious redirector at http://netcdn.tw/app/479516143/minecraft-font-free-game-hack. The document body and heuristics indicate a lure related to game hacks and generators, suggesting a phishing or malware distribution attempt. The presence of many SEO-optimized PDF links further supports the malicious intent of driving traffic to potentially harmful 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.
  • 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/479516143/minecraft-font-free-game-hack In PDF document text
    • http://library.yamasi.ac.id/repository/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/roblox-survey-for-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/nopde-cheat-engine-64-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-free-face-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/can-you-make-a-roblox-game-for-free_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/rbx-gg-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-hacks-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-generator-witout-paying-or-doing-nything_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-coins-and-spins-online-tool_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-robux-with-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/cheat-codes-for-pokemon-prism-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-btools-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-hack-someones-account-on-roblox-easy_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/roblox-controversy_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/hacked-accounts-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-daily-free-coins-link-today_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_off0000346b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x346B 22372 bytes
SHA-256: b8487ea529995db43b25edd2cd9e96c3d325d1aa02059be00d7762f9d6de1fca
font_01_sfnt_off00006601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6601 17996 bytes
SHA-256: 1349cd4e0d557016c08a9b992d3688fa2f7b3c2a17b956817b71236e999620b9

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