Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fec31b94170f236…

MALICIOUS

PDF

48.6 KB Created: 2021-06-11 00:28:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 560569bf13929464469cdc079d743d53 SHA-1: 7c2b0a407fbab1a199faf2deda63126eef5044fa SHA-256: 9fec31b94170f2362a9f0e693c9d2bc6bfcab9b72724c99804aeaaf70ee817d1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' to lure users. The primary malicious URL identified is https://netcdn.tw/app/431946152/free-robux-promo-codes-wiki-game-hack. While no scripts were extracted, the document's structure and embedded links strongly indicate a phishing or scam attempt, likely leading to further malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/free-robux-promo-codes-wiki-game-hack In PDF document text
    • http://perpus.polbitrada.ac.id/repository/minecraft-packs-free_GM479516143.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-robux-in-speech-bubble_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-free-spin-app-2021_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-robux-surveytool_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/what-pubg-uc-buy_GM1330123889.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/link-for-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/pre-hacked-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-roblox-gift-card-org_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000537f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x537F 25084 bytes
SHA-256: 626081a1247c9dbaba4266712d3e548c59d535234a48436b18a424c9d3baf2b5
font_01_sfnt_off00008dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC1 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off000098eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98EB 19088 bytes
SHA-256: 4b6d5cbe292d0b367c8ee66caa7df1ff40f666d05c8887574f149b93f99370f7

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