Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e39dfb46dee363…

MALICIOUS

PDF

32.4 KB Created: 2021-07-05 19:21:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 31b6263c64949306a09229e09e9c95da SHA-1: 20d1d49b7ef3afb5c015f49a987d3b222fa451cc SHA-256: e5e39dfb46dee3639a584cae7a0fff428ee0ab04553f669726a7d006d3a09183
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 0.9824

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.tw/app/431946152/how-to-get-hacks-on-roblox-game-hack PDF link annotation
    • https://aits.co.id/ckfinder/userfiles/files/how-to-get-free-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/promo-codes-roblox-robux-free_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/roblox-com-redeem_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/secret-roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-to-hack-roblox-accounts-2021-mac_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-robux-reedeem-codes_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-model-purchase-request-roblox-spam_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/nathorix-hacker-free-robux_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-roblox-card-codes-no-survey-no-download_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-robuxs-trackid-sp006_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/site-17-hack-gui-roblox-script_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-black-clover-roblox_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-to-hack-roblox-accounts-2021-on-ipad_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/roblox-girl-avatar_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-to-get-free-unlimited-robux_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
font_00_sfnt_off00002a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A92 21576 bytes
SHA-256: 2428b85cba9a16e67680116bc6717c6fe044e3c021085e1dad6ed9ae5b24c63c
font_01_sfnt_off000059d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59D9 18924 bytes
SHA-256: 8cdc80fef149013af70ce1ea380cb26237808cf67cdf225847d5804ac9d16e08

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