Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8682852d3823d26…

MALICIOUS

PDF

43.0 KB Created: 2021-06-14 01:36:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: aebf869e1a02ce56b4ceeaa4088ec47e SHA-1: 4970e2fd739198010d25ed4bd903649982076ffc SHA-256: c8682852d3823d26feda85c4781126a4030c9c00bb3e7674ed934632842e99d5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as free game hacks or generators. The document body and embedded URLs strongly suggest a lure to trick users into visiting these sites, likely for further malware delivery or phishing. No scripts were extracted, but the PDF structure and embedded URLs are sufficient to infer a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.co/app/431946152/rbx-robux-free-game-hack In PDF document text
    • http://libsmpn1balongpo.sch.id//repository/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/roblox-hack-tablet_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-cards-free-cards_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-place_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-co_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/easy-robux-generator_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/hack-passwords-for-roblox_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/roblox-ban_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/roblox-earn-free-robux-games_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/flob-fun-robux-hack_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-spins-ios-app_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/coalesce-roblox-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048ed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48ED 26568 bytes
SHA-256: f17b46187bbb9d6ab9b83925594506725d1d56cc73dcc2391b7f74a7da92d13a
font_01_sfnt_off000086ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86AC 18012 bytes
SHA-256: be8a0199bd83fa986fe1383a3ca212e2a6fb02078ba80d5442fc0948af0583a6

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