Malicious PDF — malware analysis report

Static analysis result for SHA-256 1878cd018eebd8d7…

MALICIOUS

PDF

33.8 KB Created: 2021-07-04 08:03:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7a22158ce13ca4eab726b02ab2d0998e SHA-1: abda5fe286da9128750efc4866ee3f0318b83be2 SHA-256: 1878cd018eebd8d76718c8e856397667b100ea7578db7d4d17345697605c5492
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, identified as a link farm, that redirect to websites offering game hacks and free items, such as 'roblox-fly-hack-game-hack'. This indicates a lure to trick users into visiting potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a malicious intent to redirect users to harmful content.

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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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.tw/app/431946152/roblox-fly-hack-game-hack PDF link annotation
    • http://digilib.pustaka.unand.ac.id/repository/roblox-shirts-for-boys-free-shipping_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/if-everything-on-roblox-was-free-part-2_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/robux-hack-apk-2021_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-to-use-editthiscooke-to-hack-accounts-in-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/i-got-this-tshirt-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/roblox-jailbreak-cheat-codes_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-to-change-your-roblox-name-for-free-2021_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/free-download-roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-to-hack-free-robux-no-downloading_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/free-roblox-gift-card-codes-not-used-2021_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/roblox-free-account-of-30-days_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-to-hack-someones-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/face-added-by-hacker-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-to-backdoor-hacking-roblox-site-v3rmillionnet_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/cheating-story-in-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/roblox-login-cheats_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/free-robux-giveaway-2_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/roblox-granny-hacks_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_off00002e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E09 22236 bytes
SHA-256: ce56b6616f79d0d21cda61d7e0b002339ded3c3f4e45658040a1f9b2f5c3a5e2
font_01_sfnt_off00005f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F33 19000 bytes
SHA-256: 85597ddf86b547b1587e1575dd14eab6ad0408ff1d5dd1947e703cb703eeca41

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