Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c05a74dc6fd024c…

MALICIOUS

PDF

28.4 KB Created: 2021-05-10 19:34:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6e2e400775ea7031562c4bf6bba73514 SHA-1: bd290c718fb1b3db593d8b576262ead62d858f2f SHA-256: 5c05a74dc6fd024c274450bb2fbadf407436c8e35d2e9b8c338f44625a21a3c5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

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 https://netcdn.xyz/app/431946152/how-to-get-free-hair-in-roblox-game-hack PDF link annotation
    • http://lib.uho.ac.id/library/repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-daily-fb-champion_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-games-com-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coinmaster-twitter_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_off00002200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2200 19664 bytes
SHA-256: 507d5f2ca1e98ea769e06ec3ff709b7197c7f20994d32d0acc60b727e09424e4
font_01_sfnt_off00004b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B4C 18564 bytes
SHA-256: d67237273ed03f92aa8c6c4764a8757174e90409c0462d06d9c122592efde19a

Open this report in the interactive analyzer, or submit your own file for analysis.