Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea317ebec7a5cbb0…

MALICIOUS

PDF

44.9 KB Created: 2021-05-12 17:31:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3009dc1df4fb8cdf8b0b28da2a8891cb SHA-1: a27530333349a747ceb1bd688365495fbb9f19fe SHA-256: ea317ebec7a5cbb088da96802b90604007a00bdafed251301df4e700e2072783
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are SEO-optimized and point to sites offering game hacks or free currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of such links, suggesting a traffic-generation or redirection scheme rather than legitimate content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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-coin-spin-daily-link-coin-master-game-hack PDF link annotation
    • http://el-ma.mtsn37jkt.sch.id/__statics/gudangsoal/files/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://el-ma.mtsn37jkt.sch.id/__statics/gudangsoal/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://el-ma.mtsn37jkt.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://el-ma.mtsn37jkt.sch.id/__statics/gudangsoal/files/coin-master-gift-link-hack_GM406889139.pdfIn PDF document text
    • http://el-ma.mtsn37jkt.sch.id/__statics/gudangsoal/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://el-ma.mtsn37jkt.sch.id/__statics/gudangsoal/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://el-ma.mtsn37jkt.sch.id/__statics/gudangsoal/files/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • http://el-ma.mtsn37jkt.sch.id/__statics/gudangsoal/files/blox-best-robux_GM431946152.pdfIn PDF document text
    • http://el-ma.mtsn37jkt.sch.id/__statics/gudangsoal/files/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://el-ma.mtsn37jkt.sch.id/__statics/gudangsoal/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://el-ma.mtsn37jkt.sch.id/__statics/gudangsoal/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://el-ma.mtsn37jkt.sch.id/__statics/gudangsoal/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://el-ma.mtsn37jkt.sch.id/__statics/gudangsoal/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://el-ma.mtsn37jkt.sch.id/__statics/gudangsoal/files/coin-master-card-collection-hack-apk_GM406889139.pdfIn PDF document text
    • http://el-ma.mtsn37jkt.sch.id/__statics/gudangsoal/files/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://el-ma.mtsn37jkt.sch.id/__statics/gudangsoal/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://el-ma.mtsn37jkt.sch.id/__statics/gudangsoal/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://el-ma.mtsn37jkt.sch.id/__statics/gudangsoal/files/coin-master-app-for-free-spins_GM406889139.pdfIn PDF document text
    • http://el-ma.mtsn37jkt.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://el-ma.mtsn37jkt.sch.id/__statics/gudangsoal/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a2a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A2A 24904 bytes
SHA-256: 196098d149cb9b4908759294d25e87df643fa823f40852c1ab7f7e8c2e2c78cd
font_01_sfnt_off000082b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82B7 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C69 18476 bytes
SHA-256: 9d60a2e782eeb8051ddff45576a6e1a66ba7dfa86d66828505d8c060f58b239a

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