Malicious PDF — malware analysis report

Static analysis result for SHA-256 31080d832108665c…

MALICIOUS

PDF

35.0 KB Created: 2021-07-06 21:56:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 287a34e82424e7c5b51e966aa4732851 SHA-1: 52bf205c6632c64cddc9858f2d7db57e1c32998d SHA-256: 31080d832108665c98b97663853de7ca29df4dfda2b3202e44f16b40826a6418
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising free game items and accounts. The primary lure URL is http://netcdn.tw/app/431946152/free-roblox-accounts-2021-with-robux-game-hack. This indicates a social engineering attack aimed at tricking users into visiting potentially harmful websites. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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/431946152/free-roblox-accounts-2021-with-robux-game-hack In PDF document text
    • http://pustaka.pn-calang.go.id/repository/how-to-get-free-clothes-on-roblox-on-ipad_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-get-free-faces-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/test-all-free-roblox-gear-free-admin-hacking-scripts_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-get-free-robux-no-generator-ios_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/how-to-get-free-robux-and-tix-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/roblox-vampire-hunters-2-going-through-walls-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/minecraft-114-download_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/doggo-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/roblox-lets-party-gear-testing-speed-and-jump-hack_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-spins-and-coins-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/coin-master-free-coins-link_GM406889139.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_002_off00002f46.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F46 22520 bytes
SHA-256: 220ffd119e5fbea3684abe22c8bc9ceb6d729bb9e7959a74d49b6b9a785a622b
font_01_sfnt_off00006168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6168 19780 bytes
SHA-256: a55470c357d6117f87c66cfcc5dd60461d5ad292bd735cfee1ec5bb843310ba7

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