Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c52ef8a2ee335b0…

MALICIOUS

PDF

48.4 KB Created: 2021-06-08 16:22:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 8e2f97b5191de4430cc8367568b9d85f SHA-1: f147c82c8968baf2bb8daaab19214a931191cd40 SHA-256: 5c52ef8a2ee335b015947fefb829625356d17b240ee52066d582837912990d81
182 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. It uses a password-protected-archive 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 0.9796

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/roblox-hack-generator-2021-game-hack PDF link annotation
    • https://opac.umrah.ac.id/repository/minecraft-items_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-coins-and-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-tiktok-accounts-and-passwords_GM835599320.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-spins-for-coin-master-on-1-19-19_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-account-hacker-tool_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-pokemon-legends-hack_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/pokemon-go-free-3-remote-raid-pass_GM1094591345.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-free-exploits_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-mod_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/mathep_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051c3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51C3 26060 bytes
SHA-256: eecc88d538476e4e418104caefebf7a26bdcbaeecd5c6add0ce8cd3065489722
font_01_sfnt_off00008f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F1B 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9906 18688 bytes
SHA-256: 43ce5a76550711531fa817643f40f7713f5b0e0945578e5158f3adc110d93bde

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