Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5730a2df86abd05…

MALICIOUS

PDF

42.5 KB Created: 2021-05-10 16:34:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0f0ece581e0aa53581a231a3fcdae314 SHA-1: 17011cdbd5eca85336d4b045cd6e58228fcfec86 SHA-256: e5730a2df86abd059b175dee3aea95127ec47a2861d33e92cc90f86007566087
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 0.9971

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 https://netcdn.xyz/app/431946152/free-robux-card-codes-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-roblox-adopt-me-pets_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/minecraft-wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/my-roblox-account-was-hacked_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/install-free-game-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-roblox-pin-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/gold-cards-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/como-hackear-coin-master-gratis_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
font_00_sfnt_off00004a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A69 24580 bytes
SHA-256: 0b54c5cfbf54c3446204a2ffd6c7e93f83740b7e3d86d5c34aff4d40e7e1b439
font_01_sfnt_off0000831c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x831C 18416 bytes
SHA-256: 79c56a0f23d4fc34690a575a065be14b64911c3c5a3331038291264b4b7107af

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