Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56404cc3066c7dd…

MALICIOUS

PDF

46.7 KB Created: 2021-05-15 13:32:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d6559ec24baafc9d742abb2ff8fd46cf SHA-1: 4e6e244cfb69d6ccf52919726807e41b1f1cb49c SHA-256: d56404cc3066c7dd47a531f68d0af1235245ab65a278f3971e7185063bbd913f
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 0.8948

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.xyz/app/406889139/how-to-earn-free-stars-on-coin-master-game-hack PDF link annotation
    • http://www.sharp-calculators.com/files/ckfinder/files/hack-roblox-players_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/free-robux-android_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/coin-master-game-hack_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/coin-master-hack-blogspot_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/coin-master-tricks_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/coin-master-hack-app-android_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/coin-master-32-android-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d02.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D02 27288 bytes
SHA-256: 991e4d7ce5f00a263e4b17d852771e0fe7f67e20b70cf934039a93a6a5544aa2
font_01_sfnt_off00008bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BBF 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00009571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9571 17872 bytes
SHA-256: 0709ca684ad5453d4a1c2d42e2fc6702b99f6275411c4f1e468931145e99bc4e

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