Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5a97194c184e0a…

MALICIOUS

PDF

33.5 KB Created: 2021-07-03 16:34:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0522ff1618d6fe3df409ff95e5b6514a SHA-1: 36c7349a5157c32f90df3c765e11cadda152feb8 SHA-256: 0a5a97194c184e0a9862ed27219637de1c939f7d69b3a0f7f1cd6a4e89645f93
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links that redirect to malicious infrastructure, masquerading as generators for game currency or hacks. The primary link, http://netcdn.tw/app/406889139/free-spins-coin-master-links-2021-game-hack, is identified as a malicious redirector. The document body and embedded URLs reinforce this lure, aiming to trick users into visiting potentially harmful sites. No scripts were extracted, but the embedded URLs and heuristic firings strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/406889139/free-spins-coin-master-links-2021-game-hack In PDF document text
    • http://lib.kesdammedan.ac.id//repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/cheat-teleportation-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/free-robux-with-no-downloading-games_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/coin-master-free-coins-link-2021-deutsch_GM406889139.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/how-to-get-10-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/free-robux-generator-online-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/roblox-speed-hack-60_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/free-roblox-cards-etsy-es_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/roblox-snow-shoveling-simulator-free-santa-bag_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/free-robux-100-works-fast_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/original-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/roblox-hack-2021-free_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_002_off00002d4a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D4A 22120 bytes
SHA-256: 4385f0dedac2e3d422c41c49d416b3709c2bb338accbcff6117659442d3c8b49
font_01_sfnt_off00005e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E80 18748 bytes
SHA-256: 755f5d066d97737e2f601bc54173dd423b74488131d7b3ccc923b215b5cc75d4

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