Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0c29495cac7137…

MALICIOUS

PDF

34.2 KB Created: 2021-06-30 01:27:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d449a320e19ee23398eab7eb7d79a5d2 SHA-1: 4dd5070fc731ff6758a0e57083f15951f6f4414d SHA-256: cb0c29495cac713763bf16fde9b43f78a5b7cba7ed76323d3a19c1434f7f2624
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document contains numerous embedded links and a call-to-action phrase, masquerading as a way to get free in-game items for popular games. The ML classifier and heuristics strongly indicate malicious intent, specifically a brand-impersonation credential phishing lure related to Facebook. The document's structure suggests it's part of a link farm designed to drive traffic to potentially malicious sites.

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.
  • 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: http://netcdn.co/app/431946152/actual-free-robux-fast-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 http://netcdn.co/app/431946152/actual-free-robux-fast-game-hack PDF link annotation
    • https://mtsn31jkt.com/__statics/gudangsoal/files/hacks-para-roblox-2021-para-todos-los-juegos_GM431946152.pdfIn PDF document text
    • http://mtsn31jkt.com/__statics/gudangsoal/files/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://mtsn31jkt.com/__statics/gudangsoal/files/free-spin-link-in-coin-master-game_GM406889139.pdfIn PDF document text
    • http://mtsn31jkt.com/__statics/gudangsoal/files/coin-master-free-spin-facebook-link_GM406889139.pdfIn PDF document text
    • http://mtsn31jkt.com/__statics/gudangsoal/files/minecraft-font-free_GM479516143.pdfIn PDF document text
    • http://mtsn31jkt.com/__statics/gudangsoal/files/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://mtsn31jkt.com/__statics/gudangsoal/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://mtsn31jkt.com/__statics/gudangsoal/files/robux-now_GM431946152.pdfIn PDF document text
    • https://mtsn31jkt.com/__statics/gudangsoal/files/robux-come_GM431946152.pdfIn PDF document text
    • http://mtsn31jkt.com/__statics/gudangsoal/files/robux-today_GM431946152.pdfIn PDF document text
    • https://mtsn31jkt.com/__statics/gudangsoal/files/how-do-u-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://mtsn31jkt.com/__statics/gudangsoal/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://mtsn31jkt.com/__statics/gudangsoal/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://mtsn31jkt.com/__statics/gudangsoal/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://mtsn31jkt.com/__statics/gudangsoal/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://mtsn31jkt.com/__statics/gudangsoal/files/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • http://mtsn31jkt.com/__statics/gudangsoal/files/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • http://mtsn31jkt.com/__statics/gudangsoal/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://mtsn31jkt.com/__statics/gudangsoal/files/how-to-robux_GM431946152.pdfIn PDF document text
    • http://mtsn31jkt.com/__statics/gudangsoal/files/free-coin-master-hack-no-verification_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
font_00_sfnt_off00003038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3038 22008 bytes
SHA-256: d369150e98d127f177a3317164453bde08add4e6dae904c2c0fc7bbaf2eaa6a7
font_01_sfnt_off00006127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6127 18896 bytes
SHA-256: b720f380a2fc74da1ca692a4f54e622a23a338a36ae0257f17152dda66c85154

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