Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81f143437dce98f…

MALICIOUS

PDF

43.3 KB Created: 2021-05-17 06:19:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cecfdd35bc0b62a7e8995daf640b43a3 SHA-1: 2296527beac6cde585cde62102eaa9ec16c9e20e SHA-256: a81f143437dce98f9a4fbbc96cbef3b19c279615219efd70f9a387fd7ecef6a7
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 0.9969

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 https://netcdn.xyz/app/406889139/coin-master-hack-apk-android-1-game-hack PDF link annotation
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/roblox-font-free_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/is-minecraft-earth-free_GM479516143.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/free-robux-obby_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/coin-master-rewards_GM406889139.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/free-roblox-card-codes_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/flame-gg-free-robux_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_003_off00004e78.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E78 24640 bytes
SHA-256: c1d864891a5b728089ac52ab136b46cbfe4eb8aab9c6be414bce881701e77b1c
font_01_sfnt_off00008718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8718 18172 bytes
SHA-256: 1b5a3ab98087fe14bd46cc871eb4c65551e68b80d8524ea8ba5845fe16c2f323

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