Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5c9fd06ab2ef38…

MALICIOUS

PDF

33.7 KB Created: 2021-07-05 00:40:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 1af276e080315e8d7858f1f6afd06735 SHA-1: d42afb28ac336437889b6ad3c256c70a22e68f84 SHA-256: fb5c9fd06ab2ef384b542ddf2d3da47a0cfc0ec8ba78c4b7dfb3fe9fc991142c
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 0.9980

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/835599320/can-you-get-free-tiktok-followers-game-hack PDF link annotation
    • http://razredna-nastava.net/files/free-minecraft-mods-for-pc_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-get-free-robux-in-ipad_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-have-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-get-free-robux-from-codes_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-roblox-templates_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/apps-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-hack-unlimited-robux-and-tix_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-piano-hack-no-download_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-prison-life-hack-2021_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/www-free-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-ipod-touch-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-protosmasher-whitelist-key-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-generator-codes_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_off00002eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB8 22380 bytes
SHA-256: 944dade15a333503a621c32cfdf58cca4d669804303e054fd9851f14232f6218
font_01_sfnt_off0000603b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x603B 18512 bytes
SHA-256: c83834f010d996baab37bd07b39517a603f70f430ffed21c11419bdf6f215ff7

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