Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef854fc7a02b1387…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 16:19:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 143528e679e8d2a2cfeee5dffc73736e SHA-1: b1a5e9339e600e501d6fe75dedafd841fe704dfa SHA-256: ef854fc7a02b138756921162c4440c6d0413223e8302ec2fbffbfeac5c49846b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The primary malicious URL identified is http://netcdn.tw/app/406889139/pro-free-spins-coin-master-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristics indicate it's designed to redirect users to potentially harmful content, likely as part of a phishing or scam campaign.

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/pro-free-spins-coin-master-game-hack In PDF document text
    • http://lib.bppsdmp.pertanian.go.id/main/repository/tiktok-free-like-and-followers-apk_GM835599320.pdfIn PDF document text
    • http://lib.bppsdmp.pertanian.go.id/ciawi/repository/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.bppsdmp.pertanian.go.id/kupang/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.bppsdmp.pertanian.go.id/kupang/repository/free-spins-coinmaster_GM406889139.pdfIn PDF document text
    • http://lib.bppsdmp.pertanian.go.id/ciawi/repository/best-game-to-hack-on-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.bppsdmp.pertanian.go.id/kupang/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.bppsdmp.pertanian.go.id/main/repository/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://lib.bppsdmp.pertanian.go.id/ciawi/repository/roblox-paintball-by-daxter33-level-hack_GM431946152.pdfIn PDF document text
    • http://lib.bppsdmp.pertanian.go.id/kupang/repository/free-robux-growbuxnet_GM431946152.pdfIn PDF document text
    • http://lib.bppsdmp.pertanian.go.id/ciawi/repository/roblox-jailbreak-checked-cash-money-hack_GM431946152.pdfIn PDF document text
    • http://lib.bppsdmp.pertanian.go.id/ciawi/repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://lib.bppsdmp.pertanian.go.id/kupang/repository/free-roblox-script-executor_GM431946152.pdfIn PDF document text
    • http://lib.bppsdmp.pertanian.go.id/kupang/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://lib.bppsdmp.pertanian.go.id/ciawi/repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.bppsdmp.pertanian.go.id/ciawi/repository/earn-free-robux-scam-sites_GM431946152.pdfIn PDF document text
    • http://lib.bppsdmp.pertanian.go.id/main/repository/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • http://lib.bppsdmp.pertanian.go.id/ciawi/repository/roblox-games-202120213-free-robux-roblox-game_GM431946152.pdfIn PDF document text
    • http://lib.bppsdmp.pertanian.go.id/main/repository/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.bppsdmp.pertanian.go.id/kupang/repository/how-to-get-into-roblox-games-for-free_GM431946152.pdfIn PDF document text
    • http://lib.bppsdmp.pertanian.go.id/ciawi/repository/tool-roblox-hack_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_off000032cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32CD 22172 bytes
SHA-256: 6937ed35530e4c66d215bfabf48982b4ccea398c8e6f910e6ecde32af528b9b1
font_01_sfnt_off000063fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63FA 18328 bytes
SHA-256: c6394313e1f22ac38e9834834d5130977e3134b49299db19683d226b8769dbd5

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