Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8ad21fbd77756b…

MALICIOUS

PDF

36.5 KB Created: 2021-07-01 20:34:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3ab7aad16c293ed37f9439bb7e0761b8 SHA-1: abe7a75d29a227019e15afae2d0720570c0aa391 SHA-256: 4d8ad21fbd77756b2c6378b6aa0fc73408193cd624a4350544d58bb231672010
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.co/app/431946152/free-roblox-toy-codes-2021-game-hack PDF link annotation
    • http://elearning.mis-arrahmahuk.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://elearning.mis-arrahmahuk.sch.id/__statics/gudangsoal/files/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://elearning.mis-arrahmahuk.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • http://elearning.mis-arrahmahuk.sch.id/__statics/gudangsoal/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://elearning.mis-arrahmahuk.sch.id/__statics/gudangsoal/files/roblox-adopt-me-pet-hacks_GM431946152.pdfIn PDF document text
    • http://elearning.mis-arrahmahuk.sch.id/__statics/gudangsoal/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://elearning.mis-arrahmahuk.sch.id/__statics/gudangsoal/files/coin-master-cards-for-free_GM406889139.pdfIn PDF document text
    • http://elearning.mis-arrahmahuk.sch.id/__statics/gudangsoal/files/minecraft-free-reddit_GM479516143.pdfIn PDF document text
    • http://elearning.mis-arrahmahuk.sch.id/__statics/gudangsoal/files/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://elearning.mis-arrahmahuk.sch.id/__statics/gudangsoal/files/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.mis-arrahmahuk.sch.id/__statics/gudangsoal/files/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://elearning.mis-arrahmahuk.sch.id/__statics/gudangsoal/files/coin-master-free-spins-ios-app_GM406889139.pdfIn PDF document text
    • http://elearning.mis-arrahmahuk.sch.id/__statics/gudangsoal/files/coin-master-apk-hack-3527_GM406889139.pdfIn PDF document text
    • http://elearning.mis-arrahmahuk.sch.id/__statics/gudangsoal/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://elearning.mis-arrahmahuk.sch.id/__statics/gudangsoal/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://elearning.mis-arrahmahuk.sch.id/__statics/gudangsoal/files/free-roblox-gift-code-live_GM431946152.pdfIn PDF document text
    • http://elearning.mis-arrahmahuk.sch.id/__statics/gudangsoal/files/body-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mis-arrahmahuk.sch.id/__statics/gudangsoal/files/coin-master-hack-version-download-2021-ios_GM406889139.pdfIn PDF document text
    • http://elearning.mis-arrahmahuk.sch.id/__statics/gudangsoal/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://elearning.mis-arrahmahuk.sch.id/__statics/gudangsoal/files/rocitizens-roblox-cheat-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off00003490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3490 23004 bytes
SHA-256: f6d96fc3fddfc68a674bf9630646c67afd1a655480cee6c5d4309fc57c8259ad
font_01_sfnt_off0000687b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x687B 19404 bytes
SHA-256: d69dc009ca5c1a88d041a827f1c58a74829db1b517c4b80ace25ccdd541b8d6b

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