Malicious PDF — malware analysis report

Static analysis result for SHA-256 3864fe697e7699dc…

MALICIOUS

PDF

34.7 KB Created: 2021-07-09 08:11:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8b11e4a089d9e0940d34bab52b966190 SHA-1: df2a36f8dbb1caab46095a83be03244bd68fd4f9 SHA-256: 3864fe697e7699dcc41dc6b42c75828b66a92b497e3a244aacdc8d14a803ac36
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/406889139/coin-master-hack-2021-android-game-hack PDF link annotation
    • http://www.nfca.org.tw/upload/files/roblox-generator_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-how-to-hack-accounts-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-do-you-get-free-outrageous-builders-club-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-hack-tool-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/roblox-secret-cheat-codes-for-music-steven-universe_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-roblox-boy-hair-codes_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-roblox-promo-codes-march-21-2021_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/collect-free-spin-linms-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/minecraft-net-free_GM479516143.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/pubg-uc-redeem-code-2021_GM1330123889.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-hack-roblox-on-a-laptop_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-hack-online-link_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_off0000304b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x304B 22976 bytes
SHA-256: 3ab274f2eb1fd14491e7d94247ba55d473c77041b4c75f58be1cc72c0833e65c
font_01_sfnt_off000063cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63CD 18580 bytes
SHA-256: f67f88b1ce6c5db430876b5da8c68a5518a964090ab37f1ab5b5be580e390e4d

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