Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cce5e2a6d9d0490…

MALICIOUS

PDF

41.5 KB Created: 2021-05-19 01:23:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b70aefd0a3344533dde85702ce074a6f SHA-1: 2b560361089875a020393d4c5e21b3a4f297afec SHA-256: 4cce5e2a6d9d0490d938ede3298098854ebf118f5a31718ed5cda7413e45aaf1
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 0.9971

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/rbx-com-game-hack PDF link annotation
    • http://tckontrola.hr/files/free-to-play-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://tckontrola.hr/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://tckontrola.hr/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://tckontrola.hr/files/how-to-get-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • https://tckontrola.hr/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://tckontrola.hr/files/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://tckontrola.hr/files/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • https://tckontrola.hr/files/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
    • http://tckontrola.hr/files/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://tckontrola.hr/files/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • https://tckontrola.hr/files/coin-master-hack-apk-ios_GM406889139.pdfIn PDF document text
    • http://tckontrola.hr/files/free-minecraft-client_GM479516143.pdfIn PDF document text
    • https://tckontrola.hr/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://tckontrola.hr/files/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://tckontrola.hr/files/robux-free-co_GM431946152.pdfIn PDF document text
    • https://tckontrola.hr/files/coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://tckontrola.hr/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://tckontrola.hr/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://tckontrola.hr/files/roblox-free-online-game_GM431946152.pdfIn PDF document text
    • http://tckontrola.hr/files/free-spins-on-coin-master-game_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
stream_003_off0000467d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x467D 25452 bytes
SHA-256: a6a293543e561e7d4f7b67ab1503ec4b39b9e101dca36108cfaef09ac94ddcfa
font_01_sfnt_off000080a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80A3 17972 bytes
SHA-256: dffe5730268319e8d6523eb3a7b4d2737e6b1bc7523d2c18f722e59dff9dcb58

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