Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cd68dd2a2e8af8…

MALICIOUS

PDF

34.0 KB Created: 2021-07-08 23:42:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dc935fea455f5c707f69873c2f1e2e42 SHA-1: 4f04dd2a901ebc3cc8ea23507d07d1197e639d90 SHA-256: 90cd68dd2a2e8af8330c8e06e940a135f91c13d9a98fc817e805b4be5bfba524
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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 http://netcdn.tw/app/479516143/how-to-get-minecraft-for-free-on-pc-game-hack PDF link annotation
    • https://bwsrubber.com/image/data/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/coin-master-spin-hack-pc_GM406889139.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/how-to-use-free-models-in-roblox_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/boku-no-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/free-robux-glitch-mobile_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/roblox-hack-adopt-me-2021_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/free-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/hack-para-roblox-2021-noviembre_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/hightlighter-player-roblox-cheat_GM431946152.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_off00002ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FFD 22548 bytes
SHA-256: a8392a0c51ff83463135976c9c332b02aad788f7ceffedaaaa299680754c80fb
font_01_sfnt_off00006238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6238 18316 bytes
SHA-256: 5655467c12bee0fa0248a8c5948e73232cacc99bd1e4914302b0032c669fa9f7

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