Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3dc2f334d91c13…

MALICIOUS

PDF

45.0 KB Created: 2021-06-11 10:30:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 159db5d31ef363e32060922bce5ccaf0 SHA-1: 4c815997906cbbc6bd056ddb4d09bf287eee3bf9 SHA-256: 1e3dc2f334d91c13a7008a3e47d34d9eb2642382cbab3134dbc56b10572350b6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux codes' and 'game hacks'. The primary lure URL is https://netcdn.tw/app/431946152/2021-free-robux-codes-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt, likely intended to lead users to a site that may host further malware or attempt credential harvesting.

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/431946152/2021-free-robux-codes-game-hack In PDF document text
    • http://elibrary.uniyap.ac.id/repository/best-free-roblox-tycoons_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-health-hack-code_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/cheat-roblox-traversed-wall_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/join-this-group-for-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-exploit-yoru-on-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/robux-hack-downlaod_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-get-free-robux-no-waiting-instant-robux-taniminim_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-robux-app-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/cheat-engine-roblox-youtube_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-hack-trigon_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-robux-without-phone-number_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/fre-robux-now_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-surf-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/cool-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-cat-hacked_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-robux-without-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-roblox-gift-card-codes-2021-october_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-roblox-render_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/get-free-stuff-on-roblox-2021_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
stream_004_off00004e93.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E93 26772 bytes
SHA-256: b11f2b751018ee116b639175737c2051d674ce2f15673fff4ba9d8d5b0034c08
font_01_sfnt_off00008c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C23 18588 bytes
SHA-256: 99a7ddf9d74c5200bf762a4adf6fbb600e77d18cd169b2ff31f82f24fb597866

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