Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b991f5f91d71f54…

MALICIOUS

PDF

48.1 KB Created: 2021-06-13 20:46:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 66a7631c0bc6fb15d2bd20d4de402eda SHA-1: 151255b49fd0ae3ace03175cfe5e0f8f55954f15 SHA-256: 1b991f5f91d71f54f37abfa9b21f97ca044544e770bd87fd0f45da31e5ce9f77
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 0.9013

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.co/app/431946152/robux-generator-hack-tool-game-hack PDF link annotation
    • https://lib.btkljogja.or.id/repository/free-radio-roblox_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/i-need-robux_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-bypass-cheat-engine-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/roblox-free-clothes-codes_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/best-free-exploit-roblox-pain-exist_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-roblox-exploits-october-2021_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-links-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-roblox-wings-not-decal_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-tiktok-likes-app_GM835599320.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-get-free-robux-flame-gg_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-robux-apk-pc_GM431946152.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_003_off00004ace.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ACE 29188 bytes
SHA-256: 11b9de37c04553a4e0a2e9f648ce791594491edd92799a28b273ba8b9294fb5f
font_01_sfnt_off00008c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C4A 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off000098f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98F2 18428 bytes
SHA-256: 3729c281cc733d5d096393f23144b01a5d654acfd8b48710078881a3ea93d8d2

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