Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbf5526bca1d07c…

MALICIOUS

PDF

35.1 KB Created: 2021-06-20 07:23:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 40bf585a19a02ca550ab03ff1fc20b51 SHA-1: f846e0706cf59ce551d501926f1b7efdae33cca0 SHA-256: 8dbf5526bca1d07c7047e5a3ae8306aa00bf26adc10f9950c1e557cd99669175
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks and free in-game currency. The ML classifier also flagged this PDF as malicious. The primary malicious URL identified is http://netcdn.co/app/431946152/how-to-hack-robux-links-game-hack, which is likely used to deliver a second-stage payload or further phishing content.

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.co/app/431946152/how-to-hack-robux-links-game-hack In PDF document text
    • http://library.apsidoarjo.ac.id/repository/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/pokemon-go-free-dragonite_GM1094591345.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/roblox-exploit-hack-free-download_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/roblox-assassin_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/roblox-jailbreak-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/2021-free-robux-daily-website_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/roblox-se-puede-hackear_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-roblox-gift-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/roblox-hack-apk-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/how-to-get-robux-on-roblox-with-cheat-engine-62_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/code-to-access-a-game-that-gives-90m-robux-free_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-robux-net_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
font_00_sfnt_off000031f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31F0 22440 bytes
SHA-256: cdadd9c761fca6b393cbcb0f297c26da0d937991238b3f6b1acaa6d4b8b64787
font_01_sfnt_off00006422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6422 19008 bytes
SHA-256: 388570ceeca1f6abb2f0fb4c8c51e26a206fa6a2e5c8d92cd1021524bbd28913

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