Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28e8ded2117ce37…

MALICIOUS

PDF

44.5 KB Created: 2021-05-12 00:48:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f56d47ddca6d10694326d8e01b32bd97 SHA-1: 53c63a79ad70ff0d9905cc937c4a7aac99f0ddbd SHA-256: f28e8ded2117ce37e543985b751476da9a0d73f5121bb78adc5cde821e95b4aa
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 0.9632

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/free-coin-master-spins-no-verification-game-hack PDF link annotation
    • http://calavera.be/images/wurst-112-2_GM479516143.pdfIn PDF document text
    • http://calavera.be/images/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://calavera.be/images/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • http://calavera.be/images/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/coin-master-free-spins-link-download-free_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • http://calavera.be/images/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/robux-today_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/minecraft-realms-free-codes_GM479516143.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_off000047ae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47AE 25312 bytes
SHA-256: 96710ebbe3dd3199095ed57a6624a0d82c1d13050230a53c0ccf493869e8599a
font_01_sfnt_off0000824b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x824B 2868 bytes
SHA-256: d2d857e2ddc1082c7667b23f2135a5c0ba26a2ff8b42c86c89c8e0b09aece855
font_02_sfnt_off00008c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C36 18020 bytes
SHA-256: dd5f5b200dad3ed55c7c2e4b73125e453bab6792b82eb04fea180a40f9e0c889

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