Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb2d9acf476c8354…

MALICIOUS

PDF

52.2 KB Created: 2021-06-04 01:54:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bef6530ffc07c178b1039e9426e23aab SHA-1: df2b850556e8701903ba4fffd19fdd2e634eeff0 SHA-256: eb2d9acf476c8354bc0e6ba722c296ae565cf20042cadb3420faf057c7077e4b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one pointing to a 'robux-hack-tools-game-hack' URL which is flagged as a malicious redirector. The document body also contains similar lure text and the same malicious URL, indicating a social engineering attempt to drive users to potentially malicious content. The presence of numerous external links suggests a link farm or SEO poisoning tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/431946152/robux-hack-tools-game-hack In PDF document text
    • http://pustaka.fti.unand.ac.id//repository/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/coin-master-hack-tool-v1-9-pc_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/coin-master-pet-food-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/minecraft-free-exe_GM479516143.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/113-hacked-client_GM479516143.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/free-hair-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/coin-master-daily-free-coins-link_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/how-to-change-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.fti.unand.ac.id//repository/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005006.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5006 27216 bytes
SHA-256: 583643e3be23f25386cf5491517ff47e2442ccfbb8146068dd5862753b5666d9
font_01_sfnt_off00008ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC2 3992 bytes
SHA-256: ca9cd4f0345d8483bda3e807ea4e40142b8bf70d3672af2d6a5dd7953d1a2391
font_02_sfnt_off00009be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BE4 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8F6 18320 bytes
SHA-256: cf6d0fcc2a7c18e0ae1e84145e037068603b130caaef77e993c358e364abbe1e

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