Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0166165e6803f8…

MALICIOUS

PDF

43.0 KB Created: 2021-05-17 04:03:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f161abbd3c2d58fbad720d36194cf9ae SHA-1: ac27ea9236d21ab342fdc2b169a157c54948450d SHA-256: 8d0166165e6803f829d31a004771e8967e64c57bfa2b94a8b079084dd3f3c1e9
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious due to its extensive use of lures for game hacks and free currency, redirecting to multiple external URLs. The document body and heuristics indicate a 'free generator / game hack' lure, designed to entice users to click through to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest a link farm or redirection mechanism, likely intended for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/free-roblox-accounts-with-robux-2021-game-hack PDF link annotation
    • https://bookswithapast.com/ckfinder/userfiles/files/free-coins--spins-coin-master_GM406889139.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-online-hack-generator_GM406889139.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-hack-ios-no-human-verification_GM406889139.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/tiradas-coin-master_GM406889139.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-link-today_GM406889139.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/earn-robux-online_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/free-robux-codes-no-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_003_off00004c38.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C38 24208 bytes
SHA-256: 1cac710dcff2f75cb0ac5f9dcb42552e9378d046ab7d540ac0d4d54593c01c38
font_01_sfnt_off00008349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8349 19076 bytes
SHA-256: c054b0c192e62aa8d18573c4a3caef3c11adbf34d317da17e190ba3718f8ceb0

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