Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9684d205bcfdc7…

MALICIOUS

PDF

45.8 KB Created: 2021-05-14 00:34:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dde14c1751d5b02b3458216b60a0eaf7 SHA-1: e2e6f3634f87b956f9c57a523397198abf979091 SHA-256: bc9684d205bcfdc786208c4f28591fffdc24b3ce55c05a9368712cbb9bea1645
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to game-related hacks and free items. The ML classifier strongly indicated maliciousness, and the presence of numerous links suggests a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 4

  • 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.
  • 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/406889139/is-there-any-tricks-or-working-hacks-for-coin-master-game-hack PDF link annotation
    • http://library.ulb.ac.id/repository/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-coin-master-cards-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-spins-daily-fb-champion_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-attack-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-hack-ios-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/robloxbux-us-generator_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/juego-hackeado-de-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-hack-xyz_GM406889139.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_003_off00004c4d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C4D 25140 bytes
SHA-256: 6b719a0d3a036238851c09a2dfc6e68d115efccd4c611686afee5c3f144f52c4
font_01_sfnt_off00008578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8578 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F2A 18712 bytes
SHA-256: bf9b6bef81a86b28c31fcdcf4878edb32919432b4a7a59645f7f2c7dbce8e9d8

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