Malicious PDF — malware analysis report

Static analysis result for SHA-256 4139c271ce04e8fe…

MALICIOUS

PDF

35.3 KB Created: 2021-07-05 00:12:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c2d175f947056b408d034c9dc2bdd9c5 SHA-1: ab5be54f6cd108955ed01ea3163c0f791e9c9010 SHA-256: 4139c271ce04e8fe11a88340a4d2d283db11fe90acbc6b9b800a46dd6ad0d5b1
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/406889139/coin-master-link-for-spins-game-hack PDF link annotation
    • http://perpus.wdh.ac.id/repository/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-hack-that-really-works_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/hack-into-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/https-iosgodscom-topic-20214coinmasterhack_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-remove-anti-cheat_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-robux-and-tickets-generator-2021_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/hack-roblox-tools-2021_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-free-daily-spins-today_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-high-school-cheats-horor_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/its-works-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-credit-card-hack_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/robux-free-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
stream_002_off0000336a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x336A 23136 bytes
SHA-256: e0053735f5e7560a7171e3071868d818dfd4490dffae722b02adba0720d748ec
font_01_sfnt_off0000674c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x674C 18344 bytes
SHA-256: 6ad1108e81c5525844192ddb13ab38111abd218b87fc7994796a13e0178d8bfd

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