Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec3884e8067bbbc…

MALICIOUS

PDF

34.7 KB Created: 2021-06-20 01:31:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3a57f9417817a7bd1243997d90beb683 SHA-1: 9100352ab0bd4513b7ae101b11e4cc28e459b758 SHA-256: 2ec3884e8067bbbc1c61a9528e36ff833f0024546cf71eced6e9e133625812a2
102 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDFs, forming a link farm. The document body and extracted URLs suggest a lure for free Robux or game hacks, indicating a phishing or scam attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-robux-codes-no-survey-or-verification-game-hack PDF link annotation
    • http://katalog.stikesmukla.ac.id/repository/get-me-robux_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/pokemon-go-free-codes-october-2021_GM1094591345.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/hacks-for-roblox-weight-lifting-simulator-3_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/robux-best_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/oprewards-login_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/what-is-coin-master-app_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/coin-master-hack-no-verification-ios_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-things-in-roblox-catalog_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/medikit-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-many-villages-are-in-coin-master_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_off00003132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3132 21688 bytes
SHA-256: 3582ad12574fd887bdbc78c03933dcc360796e0588f9aee919718b511e1f11d0
font_01_sfnt_off00006118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6118 19544 bytes
SHA-256: eef851ce0a338920853b460626bcf3fdc5e63467dd4e7af5890516093f8f36fe

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