Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1255ac7717f62d8…

MALICIOUS

PDF

44.2 KB Created: 2021-06-11 02:03:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0eaaeb143e99fd4b54fd256de4a09ef3 SHA-1: 20ca8b16aa85e0bca84fdd19510ec1a88da055ca SHA-256: b1255ac7717f62d8222e78ce8f75b2607dccbbcfe0dc3709cf50fd3c782e49c1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free robux' to lure users. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the embedded URLs and the nature of the lures strongly suggest a phishing or scam attempt designed to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/hacks-roblox-infinite-jump-game-hack In PDF document text
    • http://library.umla.ac.id/repository/free-spins-coin-master-app-iphone_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-printable-roblox-images_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/best-ban-roblox-face-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-lost-world-2021-com_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/is-minecraft-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/pubg-uc-via-easypaisa_GM1330123889.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-free-download-mobile_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/best-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-hack-codes_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_off00004f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F30 24920 bytes
SHA-256: e2783a3477429105a00c9cb50eaf9c95ee95efb44ba2b42986192d61fb4eeb06
font_01_sfnt_off00008781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8781 19148 bytes
SHA-256: 3c1a79e1b46d34253663339d95b4d687463f3b677f204e7079ae88973704ae84

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