Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38202eb9182377c…

MALICIOUS

PDF

49.8 KB Created: 2021-06-09 09:38:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a5f12effa79ec9f78ce4e6bfc091ee20 SHA-1: 1213a8d60d5416c6e6d3faceb9d752ca2506d4f6 SHA-256: a38202eb9182377c8c1cda397abdc15793a33470bceb12c721d474cdcb2eba16
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for game hacks and impersonates eBay to trick users into clicking a malicious link. The embedded URL, https://netcdn.tw/app/431946152/how-to-get-free-robux-grayphiny-game-hack, is the primary indicator of compromise, leading to a site that likely hosts further malicious content or phishing attempts. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/how-to-get-free-robux-grayphiny-game-hack.
  • 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.tw/app/431946152/how-to-get-free-robux-grayphiny-game-hack PDF link annotation
    • http://stitqi.ac.id/website//repository/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/roblox-re_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/coin-master-apk-hack-download_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/app-store-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/coin-master-coin-link_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/minecraft-pe-hack-client-2021_GM479516143.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/get-pokemon-go-free-coins_GM1094591345.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/promo-code-for-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/real-robux_GM431946152.pdfIn PDF document text
    • https://www.micIn 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_off0000540f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x540F 25636 bytes
SHA-256: fc1e86f8831001a6e6f36f2fad0719341a35aad4eb93a227bbcf369a7afeca9c
font_01_sfnt_off00008edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EDB 6100 bytes
SHA-256: f866077ce59d6ea276f75e4af76daa2aab5f3a1a679df144776123d85664d65c
font_02_sfnt_off00009d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D67 19152 bytes
SHA-256: e65066c4ba774f8ec2c65ae4b9424737357fd466ff4677e244bed34afad0252a

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