Malicious PDF — malware analysis report

Static analysis result for SHA-256 c214b84fee236dfd…

MALICIOUS

PDF

34.5 KB Created: 2021-07-08 14:59:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 385f4f29cafb090bfd412f16f3f6098e SHA-1: 22c25f3527271d4e2383e5506d4eb59cd9e2bd7b SHA-256: c214b84fee236dfdf3e36a8adda86b039de9ee8463bcc3c8a426bd866d810d12
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.tw/app/431946152/how-to-hack-peoples-robux-game-hack PDF link annotation
    • https://bookswithapast.com/ckfinder/userfiles/files/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/juego-de-hackear-ordenadores-en-roblox_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/free-roblox-adopt-me-accounts_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/hack-richest-roblox-account-deleted_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/roblox-death-sound-free-dwonload_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/how-to-get-free-robux-on-computer-2021-real_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/give-me-robux-now_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/hacked-roblox-format_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/how-to-get-free-vip-on-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/how-to-hack-a-roblox-account-password-2021_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/how-do-u-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/earn-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/como-hackear-jailbreak-roblox-2021_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/robux-survey_GM431946152.pdfIn PDF document text
    • https://bookswithapast.com/ckfinder/userfiles/files/earn-robux-sites_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_off00002ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ED2 22620 bytes
SHA-256: 70a9c19b4b420ed07eb31774031af7d53117834427acd42d577c37b5209c919f
font_01_sfnt_off0000618a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x618A 19104 bytes
SHA-256: 6420e76b529a0b6c7c9b0bbddb460d8f4dc14687810522d696a40b5bb6327e0d

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