Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc7f4184504aa33…

MALICIOUS

PDF

46.1 KB Created: 2021-05-15 01:28:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d35b9a5fc8a480e39211c33d09bdd48c SHA-1: 1529da620d0383f53a18cdcd965e5c0128e46057 SHA-256: 3cc7f4184504aa33b89f14d2c3e8cffd8a3c6cdda14a013e27982b8fddc89730
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 0.9432

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/coin-master-free-stars-game-hack PDF link annotation
    • https://www.efeskbb.com/upload/content/files/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/robux-rewards_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/latest-free-spin-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/generator-robux_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/coin-master-free_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/minecraft-kill-aura_GM479516143.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/minecraft-svg-images-free_GM479516143.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/how-to-find-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/rbx-place-free-robux_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_off00004b27.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B27 30620 bytes
SHA-256: f58c7a200680a33ee0c4e3716a549a65b2c5aeb87b993ff518a0a7698c97837b
font_01_sfnt_off00008991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8991 2868 bytes
SHA-256: d2d857e2ddc1082c7667b23f2135a5c0ba26a2ff8b42c86c89c8e0b09aece855
font_02_sfnt_off0000937b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x937B 17712 bytes
SHA-256: a621fa0cf6ecf429ccb0e9762dad0d1971a2824e8730eca88621f5efe7e14995

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