Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa29fb8d34f397d…

MALICIOUS

PDF

33.9 KB Created: 2021-07-03 13:30:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: db3a542bdaaa5af5d25aa7081c9c4545 SHA-1: f88842e27059ecf3d9113c08e98dde331d0b16c8 SHA-256: cfa29fb8d34f397d22fe1d855a779ca1bb6235002d038325a93de4efddf41539
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/431946152/roblox-hack-generator-game-hack PDF link annotation
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-admin-tools-hack_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/robux-generators-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-dominus-hat-roblox_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-videos-for-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-roblox-exploits-unpatched_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/instant-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/royale-high-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/official-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-rogue-lineage-hack_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/minecraft-reach-hack_GM479516143.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_off00002fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FDF 21916 bytes
SHA-256: fd9effed0869a7cf36f851565cc651dcc7317f30d1871c8d5ac9ac880536fba9
font_01_sfnt_off00006008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6008 18760 bytes
SHA-256: b79899937f6f59d67c0cc016ae9e295c0b2eeda93cfd6b0750b290eebb9c7341

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