Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b76b7286dc4a7a…

MALICIOUS

PDF

34.8 KB Created: 2021-07-01 03:58:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f951dea1e05f1ef513d919839205720b SHA-1: e0c773d022045658be2ac199080be27836f5c3b8 SHA-256: 13b76b7286dc4a7aa1a517b2c35dcdea6514cdd1b1d75bd2fb54e42016e23b42
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.co/app/431946152/sondage-for-free-robux-game-hack PDF link annotation
    • http://nationshield.ae/userfiles/files/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/glitchtale-battle-of-souls-roblox-hack-jult-31-2021_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/coin-master-free-spins-16-04-19_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/how-to-get-100-robux-on-roblox-free-2021_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/coin-master-free-spins-cash_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/coin-master-20-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/how-to-get-free-robux-on-roblox-2021-not-clickbait_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/cool-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/get-free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/free-robux-code-generator-no-download_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/roblox-hack-unlimited-robux-apk-download_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/roblox-promo-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3246 22176 bytes
SHA-256: 848a7f0e3432300fd7a8f52edf65bb86edd9f3590afa33f56ed3dbbebc5d05b4
font_01_sfnt_off00006369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6369 18888 bytes
SHA-256: 4a663e7a92bc7a0d22c337dac7f2c1ab500e06b3330116266de1198b5f3ddb94

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