Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c36ecb54d8401b…

MALICIOUS

PDF

47.9 KB Created: 2021-06-03 13:12:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a780c468c7f2c7b89ccf1140b3c854d0 SHA-1: deb6b5b1c060de80e268a2e29c2ae39e46961210 SHA-256: f2c36ecb54d8401b6a5797ad41ac6c53f65e20714aa0a646342bd65b2de8bdb7
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 0.9796

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-free-coins-and-spins-daily-summary-game-hack PDF link annotation
    • http://perpus.masda.ac.id/repository/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coinmaster-free-cards_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-links-that-don-t-expire_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-hack-without-root_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-spins-link-download-today_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/body-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-hack-coin-master-computer_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/will-tiktok-free-download_GM835599320.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005205.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5205 24460 bytes
SHA-256: 7e6bee038b473ad5d36b8f8ee11c2da088946e9638f1e5a0f31815139222b265
font_01_sfnt_off00008a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A41 3560 bytes
SHA-256: 9d03f7c6c62ba3e7fdc0441e9d982a863b2b60b781165d6920512f68ecc4a440
font_02_sfnt_off000096c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96C8 18880 bytes
SHA-256: 80e94ef00212ac5fe4220c165773dd6e8ea516dcb328b8ee80116dae5b806def

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