Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8475e7d53710ee2…

MALICIOUS

PDF

47.9 KB Created: 2021-05-11 09:34:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 720aa7d98ec07a37a7578fcdd61014b3 SHA-1: 12c303032de468a591c4dd49744742b5ee612465 SHA-256: c8475e7d53710ee235513a3942be637f888770e0fe4ab966921fa6459e5531ed
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 0.9013

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/free-coins-and-spins-for-coin-master-game-hack PDF link annotation
    • http://pkk.kom.smkn1losarang.sch.id/riped/perpustakaan/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://pkk.kom.smkn1losarang.sch.id/riped/perpustakaan/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://pkk.kom.smkn1losarang.sch.id/riped/perpustakaan/repository/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pkk.kom.smkn1losarang.sch.id/riped/perpustakaan/repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pkk.kom.smkn1losarang.sch.id/riped/perpustakaan/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://pkk.kom.smkn1losarang.sch.id/riped/perpustakaan/repository/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://pkk.kom.smkn1losarang.sch.id/riped/perpustakaan/repository/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • http://pkk.kom.smkn1losarang.sch.id/riped/perpustakaan/repository/coin-master-free-spins-2021-haktuts_GM406889139.pdfIn PDF document text
    • http://pkk.kom.smkn1losarang.sch.id/riped/perpustakaan/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://pkk.kom.smkn1losarang.sch.id/riped/perpustakaan/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pkk.kom.smkn1losarang.sch.id/riped/perpustakaan/repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://pkk.kom.smkn1losarang.sch.id/riped/perpustakaan/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://pkk.kom.smkn1losarang.sch.id/riped/perpustakaan/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://pkk.kom.smkn1losarang.sch.id/riped/perpustakaan/repository/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://pkk.kom.smkn1losarang.sch.id/riped/perpustakaan/repository/free-robux-master_GM431946152.pdfIn PDF document text
    • http://pkk.kom.smkn1losarang.sch.id/riped/perpustakaan/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://pkk.kom.smkn1losarang.sch.id/riped/perpustakaan/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pkk.kom.smkn1losarang.sch.id/riped/perpustakaan/repository/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://pkk.kom.smkn1losarang.sch.id/riped/perpustakaan/repository/real-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pkk.kom.smkn1losarang.sch.id/riped/perpustakaan/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d75.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D75 30408 bytes
SHA-256: 4de9d78002570893978cad0cc88b80ab6156b98a213e96a849366b53e1e740bc
font_01_sfnt_off00008e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E2C 3460 bytes
SHA-256: 582708023ba280d4d50e04d3196ed4a98a24323596270ce5a55f31618faa5208
font_02_sfnt_off00009999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9999 18060 bytes
SHA-256: f1068137021f01f6b5cc3550273fdf5362b49e27ffe305b66dd7920a08d48120

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