Malicious PDF — malware analysis report

Static analysis result for SHA-256 87dd493c779c9a3e…

MALICIOUS

PDF

45.4 KB Created: 2021-05-10 14:49:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 63b9517b3d3a1582e4bc2504b4304f6e SHA-1: 5345ba06af4236dc39d9904939e78becf8020d0d SHA-256: 87dd493c779c9a3eb9f7bfe969a50edf0c5c940e062e3414ad0cb2cff6ad634c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a "download button" lure, strongly suggesting a phishing or malicious redirection attempt. The ML classifier also flagged this PDF as malicious with high confidence. The document body and extracted URLs point towards a scam related to mobile game "hacks" and "free spins", likely directing users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/twitter-coin-master-free-spins-game-hack PDF link annotation
    • http://e-library.akbid-purworejo.ac.id/repository/coin-master-card-hack-apk_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/roblox40com-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/coin-master-daily-rewards-link_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/real-working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/download-hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/roblox-accounts-for-sale-free_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/clean-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/how-to-get-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/free-coin-master-androd-cheats-2021_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/coin-master-15-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/mcpe_GM479516143.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_off00004c8c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C8C 25068 bytes
SHA-256: 17df970e3ff7fa8a042b2fd4c3c9d1252781b726a82565664ad5c1eb3546a1f5
font_01_sfnt_off00008560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8560 2920 bytes
SHA-256: 601c50867a41b9362538ff18e5f9479a0f9badf698aaf1eb7e88469c11719db7
font_02_sfnt_off00008f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F7A 18052 bytes
SHA-256: 06f68ec0900a8a665d0c319e95253c201ab611d648accf1df96cbabceb79519f

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