Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce1f1143a26f045…

MALICIOUS

PDF

43.3 KB Created: 2021-06-03 12:32:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5f268b61226fea7218f78356351d25d2 SHA-1: 4fa3f216567b70c4e0d56a5955b26239cae36be7 SHA-256: 3ce1f1143a26f0452ca4e4dca9dbba0378a9ae4f2ee2c6549f4188d7c5014e99
142 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. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9865

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.online/app/406889139/coin-master-fun-free-spins-game-hack PDF link annotation
    • https://library.elkatarie.ac.id/repository/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/roblox40com-robux_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/coin-master-free-spins-facebook_GM406889139.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_004_off00004f3d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F3D 24480 bytes
SHA-256: 93367b9f47d7abca501f1a01a0baf723286f842ce5c190f5f209a4ba9583b6f3
font_01_sfnt_off00008759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8759 18028 bytes
SHA-256: b886d19e0857ddff44b85450f57c8c2707e7243da381be74ba2c44e7741ea293

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