Malicious PDF — malware analysis report

Static analysis result for SHA-256 1133bbc695c7e816…

MALICIOUS

PDF

34.9 KB Created: 2021-06-19 15:31:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3bc9c0f26eb8e3cd455417bf329c75b4 SHA-1: 40313aa3256db6e11a7e1fe6a11282f21f4bfa85 SHA-256: 1133bbc695c7e8169a8d6af038b96259b513bfcad9c7af634951215c8a2aa514
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 0.9980

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 http://netcdn.co/app/406889139/coin-master-free-spins-link-31-march-2021-game-hack PDF link annotation
    • https://limebug.com/media/storage/editor/files/games-like-minecraft-but-free_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/paste-roblox-hack_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/what-is-wurst_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-spins-through-coin-pop_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/android-coin-master-3433-apk-hack_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-for-free-games_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-114-download_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-bloxburg-money-hacks-25-febuary-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-apk-hack-unlimited-robux-ultima-version_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-twitter-free-spins_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-donloaden-free_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-use-hashes-to-hack-someone-in-roblox_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-free-executor_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/good-free-minecraft-server-hosting_GM479516143.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
font_00_sfnt_off00003013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3013 22900 bytes
SHA-256: de7244453e64d51003a35b054c757ab7e7f2d10f491a9e59f505cfb34749b9b5
font_01_sfnt_off00006380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6380 19088 bytes
SHA-256: 4c8ff383bfc675ee23c699e868c0decf1b9f6417ddc692102889bda26189b506

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