Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18d317a73df9d83…

MALICIOUS

PDF

45.2 KB Created: 2021-05-11 14:18:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 08636de2d7674c088eb4cc0f7ef63b7d SHA-1: d31dd8aed2fe774980515e41d521c21bb31eb33d SHA-256: b18d317a73df9d837fd715bd683a4c62f99eec5ada3a61bee211aad34ef62ad8
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/free-group-roblox-game-hack.
  • 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/431946152/free-group-roblox-game-hack PDF link annotation
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/daily-spin_GM406889139.pdfIn PDF document text
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/robux-come_GM431946152.pdfIn PDF document text
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/how-to-play-minecraft-online-for-free_GM479516143.pdfIn PDF document text
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/fb-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/coin-master-free-spin-2912-2021_GM406889139.pdfIn PDF document text
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/free-coins-and-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/level-coin_GM406889139.pdfIn PDF document text
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/is-roblox-free-on-pc_GM431946152.pdfIn PDF document text
    • http://sellrbuyhere.com/uploaded_files/userfiles/files/free-robux-come_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_off00004adb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ADB 25872 bytes
SHA-256: 8208286b186205c1949f280762893ecec7104b27cb9fcb6c9081597981cd9917
font_01_sfnt_off00008464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8464 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00008e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E12 18264 bytes
SHA-256: 31cc93a5829e223d58b1b30bfb51d13dea7d7899258fccbb6445770557a8d4bf

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