Malicious PDF — malware analysis report

Static analysis result for SHA-256 628f838e45f505a9…

MALICIOUS

PDF

41.7 KB Created: 2021-05-18 05:33:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9ee52f929ec661dd64a2c42be5c83514 SHA-1: c03ef3f35e1b68feb6af702a0ebcb2f4b8c3b444 SHA-256: 628f838e45f505a9272c2a0c7bd33a978e33b67f3fa36b8190bbdcffd63ee6f4
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file 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 4

  • 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/431946152/robux-free-co-game-hack PDF link annotation
    • https://www.brainpads.com/images/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-free-spin-trick_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/coin-master-generator-free_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/roblox-gang_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/free-limiteds-roblox_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/free-coin-master-cards-link_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/cheats-coin-master-free-spins-and-news_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/roblox-re_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/minecraft-net-free_GM479516143.pdfIn PDF document text
    • https://www.brainpads.com/images/regal-world-coin-master_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
stream_003_off000048ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48AC 24836 bytes
SHA-256: b134df3cbed8422b0fa0c157f8b085c7814237f841dda26ba4d75cd39a931c82
font_01_sfnt_off0000817c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x817C 18012 bytes
SHA-256: 3f1ded8a9c51e4f0f41c660fd84d3573ebe8f92a83837bcaa523a9614d650e73

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