Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cf22d09fbd51d6…

MALICIOUS

PDF

44.5 KB Created: 2021-05-14 15:37:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: f679d95ce9421bb7db0078c999615518 SHA-1: 956f610ba0dbdebac1166c8e1e035aabd1b765a2 SHA-256: a3cf22d09fbd51d66950ea323268fc0900c2c65999624bab924d7fcfa1e440a7
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/coin-master-spin-hack-no-verification-game-hack PDF link annotation
    • https://www.utalii.ac.ke/images/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.utalii.ac.ke/images/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://www.utalii.ac.ke/images/free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://www.utalii.ac.ke/images/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://www.utalii.ac.ke/images/minecraft-tiktok-hacks_GM479516143.pdfIn PDF document text
    • https://www.utalii.ac.ke/images/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.utalii.ac.ke/images/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://www.utalii.ac.ke/images/coin-master-level-4_GM406889139.pdfIn PDF document text
    • https://www.utalii.ac.ke/images/coin-master-unlimited-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.utalii.ac.ke/images/original-roblox_GM431946152.pdfIn PDF document text
    • https://www.utalii.ac.ke/images/robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.utalii.ac.ke/images/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://www.utalii.ac.ke/images/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • https://www.utalii.ac.ke/images/free-pet-snacks-coin-master_GM406889139.pdfIn PDF document text
    • https://www.utalii.ac.ke/images/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • https://www.utalii.ac.ke/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.utalii.ac.ke/images/coin-master-2021-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://www.utalii.ac.ke/images/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.utalii.ac.ke/images/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.utalii.ac.ke/images/free-robux-instantly_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_off000048b3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48B3 25024 bytes
SHA-256: 8009d240d446f13380fac63222f1433a4643c4c33366f79cafa9064bead99609
font_01_sfnt_off00008235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8235 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C1F 18028 bytes
SHA-256: 2de0e9c41ce50443ccbc7b49ff620d9d14c87888ef748e70805f38b18b312090

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