Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53bd35f4f92e5cc…

MALICIOUS

PDF

43.7 KB Created: 2021-06-07 03:18:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d1eabbe4f22d5d3313cf7caeb24f2dea SHA-1: 222478d66f58cbf7e468e4873eca1f4da2332948 SHA-256: f53bd35f4f92e5cc2c6c9dc79a6c2466f47a7767872260fe195d6cb39dddcf5e
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'free Robux generator' which redirects to a suspicious URL. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt, likely intended to lead the user to a malicious website. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/free-robux-generator-with-no-survey-game-hack PDF link annotation
    • https://www.knjiznica-oroslavje.hr/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/pokemon-go-free-vs-ultra_GM1094591345.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/how-to-get-free-hats-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-get-free-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/roblox-exploit-download_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/haktuts-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/boku-no-roblox-hack_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_off00004efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EFB 23996 bytes
SHA-256: 00933821d87d334728c9701dcb9e5ec4087f63d141e933b90f4efe6b078f4b83
font_01_sfnt_off000085aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85AA 19124 bytes
SHA-256: 36b18288cbcb297957f91144e47972e09710538bbe948a731a8857df65249d94

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