Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ac6dc39b9c995d…

MALICIOUS

PDF

48.1 KB Created: 2021-06-09 05:06:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f173efb013328ba831af26229d319a53 SHA-1: c4a0bb864d6ca1b88386aba6aa175bb94722d960 SHA-256: 86ac6dc39b9c995d0ca1ab081fd6af3603de3bae791739bb2a3b88bb08072482
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs designed to lure users with promises of game hacks and currency. The primary lure URL is https://netcdn.tw/app/431946152/free-script-executor-roblox-2021-no-virus-game-hack. This activity is consistent with a phishing or scam campaign aiming to drive traffic to malicious or ad-filled sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-script-executor-roblox-2021-no-virus-game-hack PDF link annotation
    • http://reggieslockandkey.com/images/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/minecraft-noob-vs-pro-vs-hacker_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-tiktok-followers-no-verification-or-survey_GM835599320.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/5-million-robux-free_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-hack-online-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-minecraft-thumbnails_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/minecraft-free-demo_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/roblox-game-free-download-for-windows-10_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-minecraft-printables-food-labels_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/minecraft-com-free_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-minecraft-skin-packs_GM479516143.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_off00004f50.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F50 25428 bytes
SHA-256: 4fe8d900154bcf38006f1a4730e3319b7b67e240b962617edf6b2b91ad6ed2cb
font_01_sfnt_off00008a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A64 3608 bytes
SHA-256: 608f0dd4f6bfb6adbccec84228618ee8e4c9e09226d7330efb5300e499d1567f
font_02_sfnt_off000096ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96EC 19024 bytes
SHA-256: 7d6c20d33332e2252631c00df7a084c4d79482e19daae0179e9b71a64f346c97

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