Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cce8031f5bab8ca…

MALICIOUS

PDF

35.4 KB Created: 2021-07-09 18:18:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f2e4e382ca1a96865b1fc0201f9b593f SHA-1: 80e4b71b30d2f867ef676d05723e598a669d3b6d SHA-256: 7cce8031f5bab8ca7f16d57ea7e552b6c40d42dbff3399f65886f9edeba1e214
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/431946152/how-to-hack-roblox-to-get-robux-game-hack PDF link annotation
    • https://diendientuvn.com/public/upload/files/roblox-cheat-engine-bypass-sandbox_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/interfaz-de-hack-de-roblox_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-get-doge-head-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/roblox-hack-chrome-web-store_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/is-roblox-being-hacked-right-now_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-hack-online_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/fast-hacks-robux_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-hack-roblox-bloxawards_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-hack-2021-without-human-verification_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/roblox-executor-free_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-roblox-games-without-password_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/will-minecraft-ever-be-free_GM479516143.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_off000031a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31A1 22900 bytes
SHA-256: a473348a8285f90e5aa418be4dd0cb1671d0568e06c55d2c55b9efc908b9a7cc
font_01_sfnt_off0000653e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x653E 19064 bytes
SHA-256: c09c9d7fc19f40bea4c428d96fbce770bebbae57e04c6c8aa6719f8a293ea3a2

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