Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc42c1d6223db9e3…

MALICIOUS

PDF

33.8 KB Created: 2021-07-04 12:27:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2a4da5d66f7e67d5693a95c365119772 SHA-1: 28bbb6b815e547c91576add21c2c9a977d76fbb1 SHA-256: dc42c1d6223db9e34b0066e1d4111ee686bc1543cea9f22716aee655bf9b20f2
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external resources, many of which are hosted on what appears to be a link farm designed to lure users with promises of game hacks and currency. The primary redirector URL, http://netcdn.tw/app/431946152/roblox-free-robux-game-hack, is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a malicious redirector pattern, likely intended to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.tw/app/431946152/roblox-free-robux-game-hack In PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-free-spins-cash_GM406889139.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/free-military-pants-template-for-roblox_GM431946152.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/unjailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-skin-in-roblox-strucid_GM431946152.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-cool-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/best-hack-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-hack-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-send-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/free-roblox-exploits-2021_GM431946152.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/pokemon-go-free-and-switch-connect_GM1094591345.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/free-gift-card-codes-no-human-verification-roblox_GM431946152.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-rb-world-2-cheat-engine_GM431946152.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-hack-gamepasses-in-roblox_GM431946152.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-free-spins-link-may-2021_GM406889139.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://ee.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-more-spins-on-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_off00002edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EDB 22180 bytes
SHA-256: 81aeb265cd19b736955c6fe7d88ceec3609a53664e4cbb481dab651f0cc983e5
font_01_sfnt_off00005fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDB 18788 bytes
SHA-256: 240f26960413d3375b32b54d3a16c3eb3bd7324ec8649811f17e0fe1da2802cb

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