Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e6d0a842f399ed…

MALICIOUS

PDF

36.4 KB Created: 2021-07-05 15:42:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5ea98c18d71e8cf929df84fd19f0cbe2 SHA-1: a3595909bf7d2eb5c69b5d3f1ef83690c1ede36a SHA-256: 37e6d0a842f399ed20fc662913490981f427fedbc8cf2561147a13c05cb4965a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. 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 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/406889139/coin-master-free-2021-spin-link-today-game-hack PDF link annotation
    • http://pustaka.smpmuh2yk.sch.id/repository/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/pro-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/coin-master-date-and-time-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/roblox-games-com-free_GM431946152.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/how-to-download-minecraft-for-free-on-windows_GM479516143.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/how-to-kill-everything-on-the-map-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/coin-master-free-spin-app-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/how-to-get-free-spins-grom-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/free-executor-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/i-robux_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_off00003603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3603 22752 bytes
SHA-256: 26e3573d2afd2b34b1354ee9118bf8f349943fde8037d27dec86fc4c3044be84
font_01_sfnt_off00006914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6914 19100 bytes
SHA-256: 827fa8b7f69ea23430b11d0a5a0138b83120a1107722004eca5be2f5cbc76a94

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