Malicious PDF — malware analysis report

Static analysis result for SHA-256 d722941fc51b68c3…

MALICIOUS

PDF

43.1 KB Created: 2021-06-03 08:38:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2860c5d3f41ef7407dc229dceb61a176 SHA-1: c46a3562b5edcb2b4ae73a14b413c47d24f5597c SHA-256: d722941fc51b68c3e2bdb3f5446b82f87a2695fd1039fcbf9c0d9a5853233dfd
182 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 a fake-CAPTCHA lure. 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 0.9874

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.online/app/1094591345/pokemon-go-free-or-not-game-hack PDF link annotation
    • https://au-ma.com/image/data/files/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-free-spins-16-04-19_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-coins-and-spins-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-ios-hack-download_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-redeem-code-free_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-tiktok-likes-generator_GM835599320.pdfIn PDF document text
    • https://au-ma.com/image/data/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-flip-master-coins_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/pokemon-go-free-90-fps_GM1094591345.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-robux-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
stream_004_off00004ef6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EF6 24616 bytes
SHA-256: 495bc503f25b1b1f424a1bc2f62fd802e338c357b3bad6e28585c653cc2ff8ec
font_01_sfnt_off00008701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8701 17944 bytes
SHA-256: d89a309231fcb7bcc5776ecec7114ee07c20c28418abeaae61a6bdf3fae9cb65

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