Malicious PDF — malware analysis report

Static analysis result for SHA-256 351bf9f37aab8499…

MALICIOUS

PDF

49.4 KB Created: 2021-06-07 09:03:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b88f704ad75cfa4781ef110d40ad5a6e SHA-1: 227022a2d45b21edf6a8485c9747ee9eb8de596a SHA-256: 351bf9f37aab849937667f4ffd3a2792d498467543567c0b5c37ab13e452d1b5
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based lure. 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 0.9796

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/how-to-get-free-roblox-animations-2021-game-hack PDF link annotation
    • https://www.astrospace.com.tw/upload/files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/coin-master-time-hack_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/150-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/pubg-uc-xtrcom_GM1330123889.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/hack-event-2021-egg-hunt-roblox_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/hacks-master-coin_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/robux-fun-hack_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/roblox-hack-top-2021_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/do-robux-generators-work_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/robuxy-com-generator_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/where-can-i-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/how-to-get-free-coins-on-coin-master-2021_GM406889139.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000506b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x506B 27052 bytes
SHA-256: 5c64e2ce15a98fb667a90c7055a18bc861d5f66d9cdeff98bb3466eef545a475
font_01_sfnt_off00008e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E75 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B87 19224 bytes
SHA-256: 7f5d32ff47a889bb99c157d2853a6075816ae19ccbb102839957927279bb7bcd

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