Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce49784114d21d9a…

MALICIOUS

PDF

45.9 KB Created: 2021-06-09 07:31:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 16c5e2260429ade5c860fbd02aefac9c SHA-1: ab2bfe90785e4d59871f9dbce3c67b47de181a0b SHA-256: ce49784114d21d9a3d2dbf8612bda31f1fba3e477f5033a144d54495e24bcdd1
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9864

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/how-to-make-your-own-dominus-in-roblox-free-game-hack PDF link annotation
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/daily-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-coins-and-spins-for-coin-master_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_off000052bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52BC 25312 bytes
SHA-256: 96c06bab1b1337553e3eec9ba12a74d7b042de7e3b1d99001ee17803ac63d895
font_01_sfnt_off00008d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D64 19556 bytes
SHA-256: f3a067b54cdade2b6f3407f59583fec95ecae594ccea790d43fd78e4c8cf7aca

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