Malicious PDF — malware analysis report

Static analysis result for SHA-256 571ae58ed559b665…

MALICIOUS

PDF

41.8 KB Created: 2021-05-11 22:21:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2a8e4abc6149dd01492cdc598d737a9f SHA-1: 25729671857c97d78f7d1d476ae798828d2f9d64 SHA-256: 571ae58ed559b66508ec4182f76b195a4c903b8e78ee71083f19a34d997137fc
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/406889139/coin-master-hacks-reddit-game-hack PDF link annotation
    • http://lookpaineis.com.br/images/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • http://lookpaineis.com.br/images/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://lookpaineis.com.br/images/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lookpaineis.com.br/images/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://lookpaineis.com.br/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lookpaineis.com.br/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lookpaineis.com.br/images/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://lookpaineis.com.br/images/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://lookpaineis.com.br/images/how-do-you-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lookpaineis.com.br/images/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://lookpaineis.com.br/images/coin-master-village-3_GM406889139.pdfIn PDF document text
    • http://lookpaineis.com.br/images/coin-master-spin-link-2021_GM406889139.pdfIn PDF document text
    • http://lookpaineis.com.br/images/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • http://lookpaineis.com.br/images/get-free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://lookpaineis.com.br/images/roblox-source_GM431946152.pdfIn PDF document text
    • http://lookpaineis.com.br/images/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://lookpaineis.com.br/images/coin-master-free-spins-and-coins-today_GM406889139.pdfIn PDF document text
    • http://lookpaineis.com.br/images/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lookpaineis.com.br/images/robloxbux-us-generator_GM431946152.pdfIn PDF document text
    • http://lookpaineis.com.br/images/roblox-hack-download-pc_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
stream_003_off00004880.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4880 24948 bytes
SHA-256: 78f1b9e3c321634f55c239ec888facd386db556dc002f82bd0501d9b77102de5
font_01_sfnt_off00008204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8204 17888 bytes
SHA-256: 63a6a5d9916b9ee5af7207625cec6907b74dd50493b17e0c9eae8777c3cfd91e

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