Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87b81fe03beb60b…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 23:19:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1b6ec0115cee05d22258e4639419ab26 SHA-1: f4955302a2d5a8cdb392bf241bdd38b93d410c06 SHA-256: d87b81fe03beb60b0b4fce648e92566d23762b778f0aefcec1bb8cc047ee0fd4
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a common lure of 'game hacks' and 'free currency' to entice users to click on embedded links. The primary link, http://netcdn.tw/app/406889139/coin-master-free-soins-game-hack, is identified as a redirector likely leading to malicious content or phishing pages. The ML classifier strongly supports the malicious nature of this PDF, and the presence of external URIs indicates a potential download or redirection to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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-free-soins-game-hack PDF link annotation
    • http://lib.smklabor.sch.id/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-ad_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-speed-hack-btools-12042021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-jailbreak-mobile-cheat_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/is-pokemon-go-free-on-ios_GM1094591345.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/best-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-cheat-roblox-jailbreak-glitches_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/cheat-codes-for-call-of-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-wings-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hacks-on-roblox-app_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-hack-roblox-on-android-tablet_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-advanced-lightsabre-roblox-jalpro-star-wars_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-how-to-get-robux-free-no-hack_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-bedrock-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-war-machine-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-generator-20212021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/fashion-frenzy-game-roblox-free_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_off00003280.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3280 22664 bytes
SHA-256: e2df27d85c1b70b486fcaeb95023ec4b5537e906aab1567f8d63684f7ede48b4
font_01_sfnt_off00006533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6533 17996 bytes
SHA-256: f4306de497449c0c0250de5deec7b8066a87c54091f9de3abe5accc399ec3ddb

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