Malicious PDF — malware analysis report

Static analysis result for SHA-256 7159f6f75959aa17…

MALICIOUS

PDF

35.1 KB Created: 2021-06-30 10:58:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 24952cf85305d8eec4c106ad93601ac6 SHA-1: 72fafe2dbc9f2fa60a1b44826a8b13f72212e8f2 SHA-256: 7159f6f75959aa170d70013f2e5d14615e17a9b3377f2a1fb9b64c072234a12f
122 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that form a link farm, likely intended to direct users to malicious content or downloads related to game cheats and hacks. The heuristic firings indicate a high likelihood of malicious intent, with the ML classifier flagging it with a score of 0.998. The document body and extracted URLs suggest a lure for free game items, which is a common tactic for distributing malware.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/real-free-stuff-roblox-game-hack PDF link annotation
    • http://cintabaca.org/katalog/repository/how-to-hack-into-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-free-spin-app-iphone_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-spin-coin_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/r-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-25-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-hack-roblox-accounts-on-iphone_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-free-thumbnails_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-robux-on-roblox-on-xbox-one_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/robux-hack-no-download-or-verification_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-roblox-women-hair_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-people-girl_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/bloxawards-com-earn-free-robux-by-doing-simple-tasks_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
font_00_sfnt_off0000316a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x316A 22792 bytes
SHA-256: 66c7a265b645c8ea05385a9608fbf33e61cf4a79cf6d2cd48600152e255a88ca
font_01_sfnt_off000064ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64AC 18896 bytes
SHA-256: be540f9a03634bb58ca1a062658fdef60a114fbce57c5533a1e145f4b4c4edea

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