Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b396306d0919cdb…

MALICIOUS

PDF

45.5 KB Created: 2021-06-09 16:41:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4f2e4f9174353682b913efb058246622 SHA-1: abe682e2dda844e5541b0f9ac011ddb707d1c4ae SHA-256: 9b396306d0919cdb6c47715dd304072b2e69aafab299eff5d33fd1e51d5a6159
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 0.9864

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.tw/app/431946152/free-robux-codes-android-game-hack PDF link annotation
    • http://library.imz.or.id/repository/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.imz.or.id/repository/wurst-hacks_GM479516143.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-coin-spin-daily-link-coin-master_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/minecraft-hacked-client-bedrock_GM479516143.pdfIn PDF document text
    • http://library.imz.or.id/repository/roblox-free-wings_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-card-hack-app_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/roblox-how-to-sell-a-t-shirt-for-free_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/wurst-115_GM479516143.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/2021-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-hack-tool-v1-9-pc_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/roblox-hair-for-free_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-free-spin-facebook-link_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/how-to-create-group-in-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/is-minecraft-free-on-xbox_GM479516143.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_off00005036.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5036 27488 bytes
SHA-256: a2eaec38eae5120369b6a7e70e6bff355fac0657ac301b5352480d8b4a4223fd
font_01_sfnt_off00008f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F55 18308 bytes
SHA-256: d860df5a04b98b5e869c5d32a338d06fd61c63e77c10c304a5ba52df0ac8221c

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