Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfce0a4da2d8256…

MALICIOUS

PDF

43.7 KB Created: 2021-06-04 03:11:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 397e81d23a74e2a46c19c392bdcae643 SHA-1: 620e6fc3cb939f2d8cf07d86553d676f126e02a1 SHA-256: ddfce0a4da2d8256f12d2cc810c553077631316343a66208ee9becddb8d7f558
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 0.9865

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.online/app/479516143/free-minecraft-pe-server-game-hack PDF link annotation
    • http://perpus.unpam.ac.id/repository/how-do-you-earn-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-please_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-spin-link-free_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-app_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-play-minecraft-online-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-hacked-version_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
stream_004_off000052c7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52C7 23932 bytes
SHA-256: 087893dc099f8c2151f6c832dafe791cf8e12c7df5d27569243ff22600c6a9f5
font_01_sfnt_off0000898f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x898F 17836 bytes
SHA-256: 40ba9e4e6a96b9fbdb66fe1c3cdc29181d81f4b56a4eeac74a5dcf6bc0460396

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