Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6324faba2e5f27…

MALICIOUS

PDF

48.9 KB Created: 2021-06-03 06:36:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9be9cba2102d090a73af108b1ce96153 SHA-1: f08cd093b0d1f2ff6441af6ff730c1cb0a85c66b SHA-256: 5b6324faba2e5f27af4281ac347ec6562ed31af2934717536e4a3441356fb888
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 0.9796

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/431946152/free-old-roblox-accounts-game-hack.
  • 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.online/app/431946152/free-old-roblox-accounts-game-hack PDF link annotation
    • http://librarystkippgribl.com//repository/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/official-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/xray-mod-minecraft-114_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/no-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/comment-hacker-des-gens-sur-roblox_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-freebies_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/cheats-coin-master-free-spins-and-news_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/pubg-uc-online-free_GM1330123889.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-hack-tool-v1-9-download_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/como-hackear-coin-master-iphone_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_004_off000051dc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51DC 26208 bytes
SHA-256: 6b1deca41ce14837c5d6316c81359e6d80015b3dfb85dc3903aeceb37cc63dc0
font_01_sfnt_off00008f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F2B 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C3C 18368 bytes
SHA-256: ba2f6d3da4eaca6d1fdd270dc574262566f59b0810be26bac781a581096b393b

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