Malicious PDF — malware analysis report

Static analysis result for SHA-256 610c386d769d2f75…

MALICIOUS

PDF

47.4 KB Created: 2021-06-03 04:51:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5caa72686d14b8169465f7155073a6eb SHA-1: ab78b96cafe449c713f0347b663915a9ac06d5fe SHA-256: 610c386d769d2f756c2a70264646f92a5ccb14c89674b27cc00d2e6298b0aebd
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9832

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.online/app/431946152/roblox-free-robux-hack-game-hack PDF link annotation
    • http://bepquannhu.vn/upload/editor/files/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/download-hacked-games-com-coin-master_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/tiktok-views-free_GM835599320.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/card-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-roblox-svg_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-spin-ml-link_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005264.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5264 29828 bytes
SHA-256: 295f29c87cdc191a3b1041a4574731870d5ca16347e37bd3a4ffa95e0503400e
font_01_sfnt_off0000963e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x963E 18488 bytes
SHA-256: 44072fbb5c45a7604268a2c6438126b7db3492802a9c8847ecb07522db400813

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