Malicious PDF — malware analysis report

Static analysis result for SHA-256 078b7b2995cfae12…

MALICIOUS

PDF

45.6 KB Created: 2021-05-12 00:10:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1ed2fd39aa526a52f218fe6894bacb91 SHA-1: b1173df043172c729377aa0a73dc26791e99d5e8 SHA-256: 078b7b2995cfae122713886ebdabd900887c098a5b905b0afb3978568d0c9701
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document acts as a link farm, directing users to external websites with lures for game hacks and free currency. The primary URL, https://netcdn.xyz/app/406889139/cm-free-spin-link-today-game-hack, is a clear indicator of a phishing or scam attempt. The document's structure and numerous external links suggest an effort to drive traffic to potentially malicious or ad-filled sites, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/406889139/cm-free-spin-link-today-game-hack PDF link annotation
    • https://corbo.ru/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://corbo.ru/images/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • https://corbo.ru/images/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://corbo.ru/images/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://corbo.ru/images/game-toolbox_GM479516143.pdfIn PDF document text
    • https://corbo.ru/images/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/coin-master-ids-for-free-spins_GM406889139.pdfIn PDF document text
    • https://corbo.ru/images/easy-robux_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/how-to-hack-in-arsenal_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/robuxglobalcom-no-verification_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://corbo.ru/images/earn-robux_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/roblox-ban_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/coin-master-hack-ios-10_GM406889139.pdfIn PDF document text
    • https://corbo.ru/images/free-coins-coin-master-link_GM406889139.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_off00004808.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4808 24800 bytes
SHA-256: e67bbe017a757d3e809181230075cb07c030bf2086ea62c2a8a8774a452ad2e8
font_01_sfnt_off00008157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8157 4020 bytes
SHA-256: dbaa9c12d07f3632734605f1d5d6dee3ad5af1f57488e46d95dab68b383f08c5
font_02_sfnt_off00008edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EDF 18568 bytes
SHA-256: 25a2ee2baa32fb86b83e2840a58348e17ba7953b286ca82cf9f97985fc172f08

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