Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e89ed8d4895b5f…

MALICIOUS

PDF

45.8 KB Created: 2021-06-03 06:55:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 3fb4cf160f5ab3a8972b54c0af16daa1 SHA-1: a2e1beb3818be70248a332b56eaca5dff35a01b4 SHA-256: 95e89ed8d4895b5f10c649dce5ed4fe855a711ec46799040e5b7867ab9ba0fa7
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, specifically promoting game hacks and free currency generators. The document contains numerous links to external PDFs, many of which are hosted on what appears to be a link farm designed for SEO manipulation. One primary redirector URL, https://netcdn.online/app/406889139/coin-master-free-download-pc-game-hack, is identified as malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/406889139/coin-master-free-download-pc-game-hack In PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-free-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-daily-spin-link-app_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/wurst_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/scary-larry-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e62.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E62 24156 bytes
SHA-256: 51320ba98c36873bb4fa5194cdb220f2f7577c0b873a1083d8cb17f142e5e5d0
font_01_sfnt_off000085d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85D8 2868 bytes
SHA-256: 00109425b76763440a5569341faade0445b3c9f8514523a6f287fddbc9082efe
font_02_sfnt_off00008fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC5 18444 bytes
SHA-256: b0499442804c302970887a2d9cba6ef3f31768e477807758de6572ac3a0df5c2

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