Malicious PDF — malware analysis report

Static analysis result for SHA-256 04320c0493a391d7…

MALICIOUS

PDF

43.9 KB Created: 2021-05-11 13:35:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 91c5343ded0af2dd027358a8cdf4401d SHA-1: 3817244fe02bb78f47eb2dc222a67e6303858ee6 SHA-256: 04320c0493a391d7be6393d5fc0e3ad3fb2d32d883f576eed99aa7d17ac7d018
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 0.9969

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.xyz/app/479516143/cool-minecraft-hacks-game-hack PDF link annotation
    • https://elearning.mtsn1ciamis.sch.id/__statics/gudangsoal/files/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1ciamis.sch.id/__statics/gudangsoal/files/free-roblox-shirts-templates_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1ciamis.sch.id/__statics/gudangsoal/files/coin-master-card-collection-hack-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1ciamis.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1ciamis.sch.id/__statics/gudangsoal/files/robux-fun-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1ciamis.sch.id/__statics/gudangsoal/files/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1ciamis.sch.id/__statics/gudangsoal/files/how-to-get-free-mods-in-minecraft_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1ciamis.sch.id/__statics/gudangsoal/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1ciamis.sch.id/__statics/gudangsoal/files/free-games-like-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1ciamis.sch.id/__statics/gudangsoal/files/roblox-tix-generator_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1ciamis.sch.id/__statics/gudangsoal/files/coin-master-date-and-time-hack_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1ciamis.sch.id/__statics/gudangsoal/files/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1ciamis.sch.id/__statics/gudangsoal/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1ciamis.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1ciamis.sch.id/__statics/gudangsoal/files/village-coin_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1ciamis.sch.id/__statics/gudangsoal/files/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1ciamis.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1ciamis.sch.id/__statics/gudangsoal/files/minecraft-free-download-mac-full-version_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1ciamis.sch.id/__statics/gudangsoal/files/roblox-download-pc-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1ciamis.sch.id/__statics/gudangsoal/files/free-robux-no-verification-2021-android_GM431946152.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_003_off00004f87.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F87 26736 bytes
SHA-256: 27f6239be7481aa6f083f609019d27b30f89b64e49e1e98c55c9baaa7de63a59
font_01_sfnt_off00008a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7C 17956 bytes
SHA-256: 052a8056d5e76bd054e8f6de415126dc7fc526d2c477c3dbde74b8be28c4271b

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