Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d4cc38959f6900…

MALICIOUS

PDF

47.2 KB Created: 2021-06-09 04:32:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 80ba807a1fcb00045f938670703f89f1 SHA-1: 220a392975c57d438c5c052f47d4c3a306d4927b SHA-256: f8d4cc38959f6900e1f5324786c3e8d25f2dbae28f7edfc2860cd41f890e2bb7
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-severity heuristic firing for a game hack redirect lure, pointing to a suspicious URL. The document body, though partially corrupted, also contains references to game hacks and the same URL. The presence of embedded URLs and the nature of the lure suggest an attempt to redirect the user to a site that likely hosts further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 https://netcdn.tw/app/431946152/free-account-roblox-passebin-game-hack PDF link annotation
    • https://goodtools.tw/upload/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/www-free-robux-com_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-25-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/hack-card-collection-coin-master_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-hack-script-ragdoll_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-cheat-aimbot_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins-cheats_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/tiktok-free-palestine_GM835599320.pdfIn PDF document text
    • https://goodtools.tw/upload/files/hack-para-coin-master-singapore_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-exploit-roblox_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-cheat-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/get-free-robux-and-tix-no-survey_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-robux-for-free-2021_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_004_off00004ec7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EC7 25644 bytes
SHA-256: e32fa4cfc7e973c681480ec630f60594048e5ea117f3e095ee42327fbcca94bd
font_01_sfnt_off00008aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA2 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00009454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9454 18696 bytes
SHA-256: 9fd6c28f64d991703dc9eb7f97ca40d462b985f5770ff0bbde3b7abc5f7bcd54

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