Malicious PDF — malware analysis report

Static analysis result for SHA-256 27739fa8e06a2b10…

MALICIOUS

PDF

35.8 KB Created: 2021-07-03 20:27:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 34dbc8a4d02b13eea656db4267f1fa43 SHA-1: 4eb8cb6c47148d21897b06f2e1f426653ed3743a SHA-256: 27739fa8e06a2b10088353bff0673bb9eeda6f57cf1351ced43f9f40d1e5aac3
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-card-hack-app-game-hack PDF link annotation
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/how-to-create-a-free-vip-server-on-roblox_GM431946152.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/free-custom-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/como-hackear-coin-master-gratis_GM406889139.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/claimfree-robux_GM431946152.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/coin-master-free-gold-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/coin-master-hack-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/robux-generator-hack-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/free-dominus-roblox_GM431946152.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/roblox-how-to-get-robux-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master-without-root_GM406889139.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_off00003439.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3439 23420 bytes
SHA-256: 64f1115a1ab51523b7ea37b7a0434307935747f5f6d3bf8c6d5a069471c44060
font_01_sfnt_off0000692b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x692B 18352 bytes
SHA-256: 7a6741876b8a4f47fa99d807c74985d7cbc04f51e0567589917582e4a0dfbcea

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