Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7255168a6a50be2…

MALICIOUS

PDF

34.8 KB Created: 2021-07-03 17:57:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 432a7ae91ff292e34be43426cba66225 SHA-1: e597ba2faa8878a00a22fe45d52c588d9a492cdc SHA-256: e7255168a6a50be2dfdac04ff0ab1bc222a9d667be6a628485db6900a0064b78
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/how-to-download-minecraft-for-free-on-mac-game-hack PDF link annotation
    • https://mountainholidaytreks.com/userfiles/files/robux-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-get-free-robux-2021-xbox-one_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-get-robux-free-sin-pastebin-2021-con-jugar_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-roblox-cards-etsy-es_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-roblox-locked-accounts-with-obc-2021_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/haktuts-coin-master_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-spins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-tiktok-coins-2021_GM835599320.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-cheat-codes-free_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_off00003216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3216 22688 bytes
SHA-256: 811dee5351719c68a7fbe7be0820ecd51a14676107d81a2218323e2e5588b408
font_01_sfnt_off00006486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6486 18576 bytes
SHA-256: 3db645ecb8fb9826ba7aaba3d1c82ef7ae8964096d6f8c3c07f5dc50e3a2044e

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