Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea01ead3318de5a…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 12:21:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e202e088880d7465e258adf903ce9abf SHA-1: f382bb8a0a559757d94e616e9f8a5b5f44717e1f SHA-256: 8ea01ead3318de5a04ee3e29b295d5df0ecb67ab18f884b52cd9a3f70f1a23c8
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/406889139/coin-master-rewards-game-hack PDF link annotation
    • http://library.smpn2-byl.sch.id/repository/genarater-that-gives-free-robux_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/get-free-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id/repository/hack-that-thing-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/roblox-avatar-maker-free_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id/repository/roblox-free-adidas-teu_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-facebook-free-spins_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id/repository/robloxain-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id/repository/rollercoaster-tycoon-2-cheats-roblox_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
stream_002_off00003181.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3181 22796 bytes
SHA-256: 4e3b6faba70473390db42c24c2a20d03a50557bbc01d811c54533858999928ee
font_01_sfnt_off000064b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B9 18172 bytes
SHA-256: 6cab49e6ca20ff1f1469f9296ad06f493139d97774cf5cd9dbace47665b9357a

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