Malicious PDF — malware analysis report

Static analysis result for SHA-256 da73fc9ccd2fbba0…

MALICIOUS

PDF

45.2 KB Created: 2021-05-16 06:08:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 27992af5955472a84e110802aef77d36 SHA-1: bc5998a7a5ef13712cf714ba67f79c28e28dec2d SHA-256: da73fc9ccd2fbba0e368dab10298086942550538cc46fbdc9796cd7dcb4633ab
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 0.9621

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-hacks-for-coin-master-game-hack PDF link annotation
    • http://bob-reid-music.com/uploads/files/files/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/rbx-robux_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/how-to-download-wurst_GM479516143.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/how-to-get-java-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/coin-master-daily-free-spins-blog_GM406889139.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/freespinandcoin_GM406889139.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/get-free-robux_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/youtube-how-to-get-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_off000048ca.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48CA 26556 bytes
SHA-256: bd3880eb8026f1e8b1cd5cfb1993b69485e1513a35bcab246f014107698fc4b3
font_01_sfnt_off00008407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8407 3264 bytes
SHA-256: d66c4080ae284a9b4c30992c5983191aaa0a3e32d3a7f70f5d4649bf393320ef
font_02_sfnt_off00008f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F53 17880 bytes
SHA-256: 2beebd07a7bf3792acdee249f7a2a83ed44f2fe9f2bfb57386b991bf1122f076

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