Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe68672a317128d1…

MALICIOUS

PDF

32.8 KB Created: 2021-07-19 18:48:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: bc11973c0b4f07d08d69fd595b1c09de SHA-1: 26aa31092de8c9547908becdc53fbbaf41e9d5fc SHA-256: fe68672a317128d1dd02d656f60c471197bdf658f8cef97b9b9d0455ec7bd18e
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a malformed stream and links to known malicious redirector infrastructure, specifically advertising a "free Robux generator". The primary link directs to http://netcdn.tw/app/431946152/free-robux-without-doing-anything-game-hack, which is likely a lure to download further malicious content or exploit vulnerabilities. The document body and embedded links reinforce this lure by mentioning "Free Robux" and "game hack".

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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-robux-without-doing-anything-game-hack In PDF document text
    • http://elearning.min2bolmong.sch.id/__statics/gudangsoal/files/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://elearning.min2bolmong.sch.id/__statics/gudangsoal/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.min2bolmong.sch.id/__statics/gudangsoal/files/free-views-on-tiktok_GM835599320.pdfIn PDF document text
    • http://elearning.min2bolmong.sch.id/__statics/gudangsoal/files/free-tiktok-like_GM835599320.pdfIn PDF document text
    • http://elearning.min2bolmong.sch.id/__statics/gudangsoal/files/free-tiktok-followers-and-likes_GM835599320.pdfIn PDF document text
    • http://elearning.min2bolmong.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.min2bolmong.sch.id/__statics/gudangsoal/files/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.min2bolmong.sch.id/__statics/gudangsoal/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.min2bolmong.sch.id/__statics/gudangsoal/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://elearning.min2bolmong.sch.id/__statics/gudangsoal/files/free-tiktok-likes-2021_GM835599320.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_off000029c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29C1 22068 bytes
SHA-256: ac15b9844ff366b851f46b586c48836da495248f39bd473e96a67080f2580542
font_01_sfnt_off00005adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADF 19424 bytes
SHA-256: ce4897eff9d04202a557cf473123b6bbe5415239b22eda76d44945625b44829b

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