Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf888d7df7b1a08…

MALICIOUS

PDF

35.0 KB Created: 2021-07-08 15:19:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4e71f7b25f38516bac4d1e5304e29207 SHA-1: fb2cb8fb64b6768bfd818cf98ce3ef3e7ed6ef78 SHA-256: cbf888d7df7b1a084a405a82648c163703ea9e2cd6925cb5b651336aea92ed9e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a malicious redirector, specifically luring users with 'free generator / game hack' content. The embedded URL, http://netcdn.tw/app/431946152/how-to-get-free-robux-no-survey-game-hack, is associated with malicious redirector infrastructure. The document body reinforces this lure by mentioning 'free Robux' and providing the same URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-get-free-robux-no-survey-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/red-line-30-roblox-hack_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-earn-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-tool-v1-9-download_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/get-5-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-glitch-2021-september_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/game-hunters-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-roblox-codes_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/earn-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-account-roblox-2021_GM431946152.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_off000030b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30B4 22452 bytes
SHA-256: 90f1569d49f1be5219810910932abbbfdd3be1a3a9f9e2bfcf67ba4ffa89172d
font_01_sfnt_off000062e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62E2 19280 bytes
SHA-256: 051b1285d740c577603dabb5231f5e4d954de3c0b025fd39f0418c252076454f

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