Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd0de291732e77c…

MALICIOUS

PDF

44.8 KB Created: 2021-06-09 05:41:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4bc34f4338b13121e75f90e4cca9f027 SHA-1: af58ed846fa61fe360a6d8a1ae773cea8fde3aa0 SHA-256: bfd0de291732e77c1916ec3b5ca87f5da71feb13bb8fe358c939270b36a22ea7
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external resources advertising game hacks and free currency, suggesting a lure for users to download potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URIs further supports this assessment. While no scripts were explicitly extracted, the document's structure and embedded links indicate an attempt to exploit user interest in gaming for malicious purposes, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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.
  • 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/roblox-client-hack-game-hack PDF link annotation
    • https://lib.unitri.ac.id//repository/easy-points-gg_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-coin-master-game_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/hack-coin-master-game-download_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-hack-no-survey-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-hack-robux-animin-pannel_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-windows-10-key-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/do-coin-master-hacks-work_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/hunting-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-jailbreak-hack-client-download-trackid-sp006-trackid-sp006_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_004_off00005060.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5060 26208 bytes
SHA-256: 0d94b344889f4bf9aafddaa3aa965185815b3cb0c77b1de59be54e3ce89100b2
font_01_sfnt_off00008c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C34 18408 bytes
SHA-256: 3dd6fbeff9a19d0fc866f51f4800b45fdcdfc3e69f945d96864cba5911344d50

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