Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b4b4e8e14d9d0b…

MALICIOUS

PDF

47.8 KB Created: 2021-06-10 23:13:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d84fb3bd2cadf7e4a7ff7b56623545e2 SHA-1: 2527dfa0d934e99fe7438d12a5121f93a3fd0d3b SHA-256: 54b4b4e8e14d9d0bfd8372953bc98f8a8a53535e469f05b6ced6192eeaaa06ea
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 0.9832

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.tw/app/431946152/free-robux-promo-codes-2021-game-hack PDF link annotation
    • http://immo360grad.com/images/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/how-to-get-free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • http://immo360grad.com/images/microsoft-rewards-roblox_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/minecraft-anarchy-server-no-hacks_GM479516143.pdfIn PDF document text
    • http://immo360grad.com/images/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/how-many-levels-are-there-in-coin-master_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/lawn-mowing-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/rbxboost-earn-free-roblox_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/daily-spin_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/facebook-coin-master-free-spins_GM406889139.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_off0000530b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x530B 29752 bytes
SHA-256: 1408f84ab14de8cb5d793f74eb03a08dbfb4634a13527a453dc69c9c176415bd
font_01_sfnt_off0000967b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x967B 19004 bytes
SHA-256: 2ae4233163b81a205a597c97f5f9bceef85a21038461a0399da8d1b6d9f39b0a

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