Malicious PDF — malware analysis report

Static analysis result for SHA-256 51195204b776e728…

MALICIOUS

PDF

43.6 KB Created: 2021-06-11 02:55:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7fcb33ade00d1eaf4e2b250693098b40 SHA-1: 1e7813ea872eecd726771206fa7d568043d9b7b7 SHA-256: 51195204b776e72811c79d03aad975c548048878a2e24796a409cc98b2d4f13d
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 0.9865

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.tw/app/431946152/roblox-jeailbreak-hack-game-hack PDF link annotation
    • http://foo.com.tw/files/free-robux-real_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-spin-group_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/cpbildco-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/robux-now_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/robux-hack-apk_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-roebucks-com_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-free-draw_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-link_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/robuxmatchcon_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/im-using-a-hacked-clinet-music-id-roblox_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-spin-link-twitter_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_off00004ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CE8 25892 bytes
SHA-256: 80a87cd0fd860e9f9d5d90d7f4ffb2832eff2b38ba260a73db02db730ff69916
font_01_sfnt_off0000873d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x873D 18468 bytes
SHA-256: 9c86a3501dbf2ff1a96548b9ab5580a4d905979c0aa709d4cc1762a2fae0b2b1