Malicious PDF — malware analysis report

Static analysis result for SHA-256 527e0d9804822b2a…

MALICIOUS

PDF

33.5 KB Created: 2021-07-04 13:32:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d02cfdb24b928544a44f2f8b1f9bd1e9 SHA-1: 20208d82fd6aa6d7c300a175f47196720560574f SHA-256: 527e0d9804822b2af72071aa68c1bb7cba4b6fa598bee328a6a4be934b478ece
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/free-spin-online-tool-coin-master-game-hack PDF link annotation
    • https://e-kbm.man2ska.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • https://e-kbm.man2ska.sch.id/__statics/gudangsoal/files/comment-hacker-roblox-macbook-pro_GM431946152.pdfIn PDF document text
    • https://e-kbm.man2ska.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://e-kbm.man2ska.sch.id/__statics/gudangsoal/files/free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://e-kbm.man2ska.sch.id/__statics/gudangsoal/files/roblox-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://e-kbm.man2ska.sch.id/__statics/gudangsoal/files/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • https://e-kbm.man2ska.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021-app-download_GM406889139.pdfIn PDF document text
    • https://e-kbm.man2ska.sch.id/__statics/gudangsoal/files/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://e-kbm.man2ska.sch.id/__statics/gudangsoal/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://e-kbm.man2ska.sch.id/__statics/gudangsoal/files/easiest-character-to-make-a-roblox-account-for-free_GM431946152.pdfIn PDF document text
    • https://e-kbm.man2ska.sch.id/__statics/gudangsoal/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • https://e-kbm.man2ska.sch.id/__statics/gudangsoal/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://e-kbm.man2ska.sch.id/__statics/gudangsoal/files/free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://e-kbm.man2ska.sch.id/__statics/gudangsoal/files/free-roblox-robbux_GM431946152.pdfIn PDF document text
    • https://e-kbm.man2ska.sch.id/__statics/gudangsoal/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://e-kbm.man2ska.sch.id/__statics/gudangsoal/files/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://e-kbm.man2ska.sch.id/__statics/gudangsoal/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://e-kbm.man2ska.sch.id/__statics/gudangsoal/files/juno-hack-roblox_GM431946152.pdfIn PDF document text
    • https://e-kbm.man2ska.sch.id/__statics/gudangsoal/files/what-are-points-for-in-roblox_GM431946152.pdfIn PDF document text
    • https://e-kbm.man2ska.sch.id/__statics/gudangsoal/files/how-do-u-hack-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
font_00_sfnt_off00002fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FBF 22040 bytes
SHA-256: 8a773c92d8af856aeb4fc256f0c1e12c835e9a23dd5f8cbf42cf3adc84014bfe
font_01_sfnt_off00006070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6070 18248 bytes
SHA-256: 652ac15c20e032905adb19760bc376fa248cf13b54e93c508fb033e8a92ab292

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