Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c26b3935fc2c479…

MALICIOUS

PDF

35.4 KB Created: 2021-06-29 18:29:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 05af9c1dc36896563a9a929897694f18 SHA-1: 1329f56fe1d3835409af1d52a00a4811d1a54c8e SHA-256: 3c26b3935fc2c4793b583ffcbbea7cae49c84eba5bec1485fd5b6908c35c2f6e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to a known malicious redirector infrastructure, disguised as offers for free game currency and hacks. The document body explicitly mentions 'Free Promo Codes For Roblox 2021 Not Expired Robux' and includes a call-to-action URL. The presence of these lures and the redirection to malicious sites strongly suggests a phishing or scam attempt, likely delivered as a spearphishing attachment.

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/free-promo-codes-for-roblox-2021-not-expired-robux-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-robux-hack-app_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-free-no-download_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-roblox-codes-that-nobody-have-havent-used-yet_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-robux-hack-generator-2021-november_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-administrator-badge-hack-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-infinite-health-hack_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-spins-link-2021-iphone_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-how-to-customize-your-character-for-free_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-robux-and-tix-without-verification_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/give-me-free-robux_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
font_00_sfnt_off000030ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30AD 22184 bytes
SHA-256: 6e67f6c003ebccf42205973c8ec6f8211da840f3f89e8592a297ae894518b94f
font_01_sfnt_off000061f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F6 20180 bytes
SHA-256: 0b98eb95b7d07dbe788b7dd6536f5116811a25cc7aea8c1f2dd597f57713926f

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