Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62976d8c8a4e6d6…

MALICIOUS

PDF

45.2 KB Created: 2021-05-10 16:02:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 69214a075016fbd69af024537caf99d5 SHA-1: 08c2d4d97b1c43db1c4cbcc25906852ccf146548 SHA-256: d62976d8c8a4e6d6c1340d6bd1ecd7ec4d7b63d05cb9f4b78c2899bfc77fa84d
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 0.9551

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-free-coins-link-game-hack PDF link annotation
    • http://rgadventure.com/userfiles/files/how-to-get-free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/hack-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/mcpe-116_GM479516143.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-facebook-page_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/www-rbx-com_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/totally-free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/mcpe-master-unlimited-coins-free-download_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-spin-blogspot_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c72.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C72 24872 bytes
SHA-256: 15de357433d500626a717cc4e308d9a31903d6cf7dd72aaaaa6e92d093640541
font_01_sfnt_off0000856e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x856E 2920 bytes
SHA-256: 601c50867a41b9362538ff18e5f9479a0f9badf698aaf1eb7e88469c11719db7
font_02_sfnt_off00008f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F88 17880 bytes
SHA-256: 5ce88b684446e36e89a0643934549b22fce1d776877bbe9d9a558feafde7429d

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