Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbeda30ee3dc5a9…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 13:17:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0522eb33e47a850a10e914180cb37d15 SHA-1: 182e6cdfdab10456aba8cd1a0abd980970f1251a SHA-256: 4cbeda30ee3dc5a92d2d4e926fea2899eeaac427af62f4f698fb5331937c430d
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 0.9980

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 http://netcdn.tw/app/479516143/minecraft-dungeons-free-game-hack PDF link annotation
    • https://www.dunnagebags4u.com/uploaded_files/userfiles/files/roblox-games-with-free-boombox_GM431946152.pdfIn PDF document text
    • https://www.dunnagebags4u.com/uploaded_files/userfiles/files/how-to-hack-peoples-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.dunnagebags4u.com/uploaded_files/userfiles/files/money-cheats-for-rocitizens-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.dunnagebags4u.com/uploaded_files/userfiles/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.dunnagebags4u.com/uploaded_files/userfiles/files/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • https://www.dunnagebags4u.com/uploaded_files/userfiles/files/roblox-hacks-for-bloxburg_GM431946152.pdfIn PDF document text
    • https://www.dunnagebags4u.com/uploaded_files/userfiles/files/free-robux-accounts_GM431946152.pdfIn PDF document text
    • https://www.dunnagebags4u.com/uploaded_files/userfiles/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.dunnagebags4u.com/uploaded_files/userfiles/files/free-robux-promo-code-for-blox-land_GM431946152.pdfIn PDF document text
    • https://www.dunnagebags4u.com/uploaded_files/userfiles/files/facebook-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.dunnagebags4u.com/uploaded_files/userfiles/files/roblox-pizza-cheat-engine-script_GM431946152.pdfIn PDF document text
    • https://www.dunnagebags4u.com/uploaded_files/userfiles/files/coin-master-free-spins-daily-link-game-mod_GM406889139.pdfIn PDF document text
    • https://www.dunnagebags4u.com/uploaded_files/userfiles/files/free-tv-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.dunnagebags4u.com/uploaded_files/userfiles/files/roblox-what-do-you-do-when-your-account-gets-hacked_GM431946152.pdfIn PDF document text
    • https://www.dunnagebags4u.com/uploaded_files/userfiles/files/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • https://www.dunnagebags4u.com/uploaded_files/userfiles/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.dunnagebags4u.com/uploaded_files/userfiles/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.dunnagebags4u.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.dunnagebags4u.com/uploaded_files/userfiles/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.dunnagebags4u.com/uploaded_files/userfiles/files/free-shirt-templates-roblox_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_off00003423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3423 22192 bytes
SHA-256: 093ebd78c315be4b3fc2100ccb37ec3c4011d9a44dc9b7693d008e0bda129b81
font_01_sfnt_off00006548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6548 18304 bytes
SHA-256: f6a577bc3f56294164eedaca4aa626844c61f0adb940d643d6f78e4abd993284

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