Malicious PDF — malware analysis report

Static analysis result for SHA-256 e94c53ffd86dcb83…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 06:42:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 08309df0a9eac328094634d65df0d914 SHA-1: b0dcb0b5e5561bac99c57dc548c2bde66f12b136 SHA-256: e94c53ffd86dcb83a3bfb2a1b04ac347ba1250b157f30d1682b924404de49ef3
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 0.9865

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.online/app/406889139/coin-master-time-hack-game-hack PDF link annotation
    • http://opac.kolejkrim.edu.my/repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-free-school_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-coin-master-spins-link-download_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://coinmasterspinandcoin.comIn 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
stream_004_off00004fa2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FA2 25996 bytes
SHA-256: 7a9b8592436d21c695fd32569adec12d8297a48ef0795aa7c4e1c2695f984c03
font_01_sfnt_off00008c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2B 17976 bytes
SHA-256: 87fff38dbb03260eba139e3e02117f9160eb94cd4e4c58474dc2e0f8f330ccfe

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