Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0c24bb8d89ff7a…

MALICIOUS

PDF

45.8 KB Created: 2021-06-03 14:40:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7a1059990888cd266552288cf5f8f970 SHA-1: ab6d887c811fc2769bcec91bfc4fa2d22693a408 SHA-256: aa0c24bb8d89ff7abfe97ada6866b04e72158a4a003eaec227c49589dc8bf86b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, identified as a link farm, that redirect to websites promising game hacks and generators. One prominent URL is https://netcdn.online/app/406889139/coinmaster-hack-game-hack, which appears to be a lure for users seeking cheats. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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/coinmaster-hack-game-hack PDF link annotation
    • https://katalog.smkn1glagah.sch.id/repository/mcpe-client_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-minecraft-printables-food-labels_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/hackear-coin-master-sin-verificacion_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/hack-the-game-coin-master_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-online-hack_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/pokemon-go-free-zaragoza_GM1094591345.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/haktuts-coin-master-free-spin-today_GM406889139.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_004_off00004d91.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D91 25448 bytes
SHA-256: 368d3626623d8c0221b3f61e0f3ddd4299747f3be22d8f4e6489266e485f8231
font_01_sfnt_off00008795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8795 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9147 17976 bytes
SHA-256: d0b6a121b0ad4618c251f37f895f744a254c5dff228d95ccb86b2837b7d4678c

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