Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c14353e337b4a1…

MALICIOUS

PDF

46.6 KB Created: 2021-05-11 21:31:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 43986e1b965f59c1e59dd698fb2bb2f4 SHA-1: 5da88bb522e18db78fb3e8793001245680ef9e34 SHA-256: 31c14353e337b4a11a6c20c5075a79ac7bbb48878ab8ad8b06b3cad0ef4f0a2a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'robux hack tools' and 'game hacks'. The document body, though heavily obfuscated, contains references to these lures and the primary malicious URL. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the use of redirector infrastructure for a lure-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://netcdn.xyz/app/431946152/robux-hack-tools-game-hack In PDF document text
    • http://opac.ekonomi.up45.ac.id/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://opac.ekonomi.up45.ac.id/repository/mcpe-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://opac.ekonomi.up45.ac.id/repository/free-spin-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://opac.ekonomi.up45.ac.id/repository/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://opac.ekonomi.up45.ac.id/repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://opac.ekonomi.up45.ac.id/repository/coin-master-pro-hack_GM406889139.pdfIn PDF document text
    • http://opac.ekonomi.up45.ac.id/repository/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://opac.ekonomi.up45.ac.id/repository/coin-master-ios-gods-hack_GM406889139.pdfIn PDF document text
    • http://opac.ekonomi.up45.ac.id/repository/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://opac.ekonomi.up45.ac.id/repository/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • http://opac.ekonomi.up45.ac.id/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://opac.ekonomi.up45.ac.id/repository/coin-master-play-online-free_GM406889139.pdfIn PDF document text
    • http://opac.ekonomi.up45.ac.id/repository/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.ekonomi.up45.ac.id/repository/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://opac.ekonomi.up45.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://opac.ekonomi.up45.ac.id/repository/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.ekonomi.up45.ac.id/repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://opac.ekonomi.up45.ac.id/repository/latest-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://opac.ekonomi.up45.ac.id/repository/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://opac.ekonomi.up45.ac.id/repository/free-coins-coin-master-2021_GM406889139.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_off00004a2d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A2D 31812 bytes
SHA-256: ecdcd522dd2484c91e36872d939cb81beef7d12ae32ac861386aae726edcde5b
font_01_sfnt_off000093d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93D1 18320 bytes
SHA-256: cf6d0fcc2a7c18e0ae1e84145e037068603b130caaef77e993c358e364abbe1e

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