Malicious PDF — malware analysis report

Static analysis result for SHA-256 6950e3a7a5e30b82…

MALICIOUS

PDF

49.7 KB Created: 2021-06-07 17:19:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 980c50b139957f5b982e34a8b48d06f3 SHA-1: 6f23019816a6c05f2b4665ba4c6e5948bcd20d21 SHA-256: 6950e3a7a5e30b822c0bd4e2c41b9a3882285022eec3a1c3dbc7bbbfc0fcba30
130 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. It uses a fake-CAPTCHA lure and 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 6

  • 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
  • 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/free-accounts-with-robux-2021-june-game-hack PDF link annotation
    • http://manfeld.dk/images/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://manfeld.dk/images/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://manfeld.dk/images/robux-game-com_GM431946152.pdfIn PDF document text
    • http://manfeld.dk/images/easy-robux-generator_GM431946152.pdfIn PDF document text
    • http://manfeld.dk/images/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://manfeld.dk/images/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • http://manfeld.dk/images/download-hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://manfeld.dk/images/free-tiktok-likes-no-survey_GM835599320.pdfIn PDF document text
    • http://manfeld.dk/images/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • http://manfeld.dk/images/pokemon-go-free-online-game_GM1094591345.pdfIn PDF document text
    • http://manfeld.dk/images/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://manfeld.dk/images/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • http://manfeld.dk/images/how-to-get-unlimited-xp-in-pokemon-go_GM1094591345.pdfIn PDF document text
    • http://manfeld.dk/images/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • http://manfeld.dk/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://manfeld.dk/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://manfeld.dk/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://manfeld.dk/images/facebook-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://manfeld.dk/images/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://manfeld.dk/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000523d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x523D 26628 bytes
SHA-256: 3802486e64ff7859ca473d3ca4b9cdb7720e68dd0665a5a4b3617438bc829f38
font_01_sfnt_off00008fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC5 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CD7 19168 bytes
SHA-256: 7402df2800dfa1e0c2f0542bb8139add9d7c1ca5d684560b6338549bb288c94f

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