Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ba6bb5fc1b1ca4…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 12:52:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ca15a3170d4dc30c8b2ec7b80e22f2de SHA-1: d39e89f65753abc4b19820b9b20354bdae229c80 SHA-256: 10ba6bb5fc1b1ca4de117dd846aa6ade5a91fb55b7dcd315c8cbc077865f87c2
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, identified as a 'PDF SEO Link Farm' heuristic, designed to lure users with game hack promises. The primary URL http://netcdn.tw/app/406889139/coin-master-free-spins-link-hack-game-hack and many others hosted on gts.edu.gh are likely part of a scheme to drive traffic or potentially serve malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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/406889139/coin-master-free-spins-link-hack-game-hack PDF link annotation
    • http://gts.edu.gh/library/repository/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-change-your-name-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-level-4_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-reach-hacks-in-sf-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/does-free-r-here-in-roblox-actually-work_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/join-my-group-for-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-hack-genorator_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/earn-robux-for-free-offers_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-ten-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/comment-hacker-un-compte-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-hack-roblox-one-piece-millenieum_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/hacks-for-roblox-island-royale_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/ww-roblox-come_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_off0000313b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x313B 22988 bytes
SHA-256: 937120e183759b48330fae9e4eb013264cd0758132e3df8d8fc96ec5799fa90f
font_01_sfnt_off000064d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D5 18344 bytes
SHA-256: 0b72bc8737a749971cae617558934a0ee4712de3499baa483a9ef910788e25c1