Malicious PDF — malware analysis report

Static analysis result for SHA-256 f271d9994ef6a90a…

MALICIOUS

PDF

32.6 KB Created: 2021-07-19 07:40:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9ad49a8a758a84880bff8d4fd72a2eb5 SHA-1: 39d0da720effb70d7af47557f5210115ca558837 SHA-256: f271d9994ef6a90ae0a90deb80f5588a2e148d5e7934900b6e7f11113e48127c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for 'Free Robux' and a link to a known malicious redirector. The document body and embedded link text explicitly mention 'Free Robux No Human Verification Or Survey Or Download', indicating a phishing or scam attempt. The embedded link directs to http://netcdn.tw/app/431946152/free-robux-no-human-verification-or-survey-or-download-game-hack, which is flagged as malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8903

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-robux-no-human-verification-or-survey-or-download-game-hack In PDF document text
    • http://elearning.mtsn2bolmong.sch.id/__statics/gudangsoal/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2bolmong.sch.id/__statics/gudangsoal/files/free-robux-discord_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_off000026cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26CF 22568 bytes
SHA-256: 9d88f38f3fae46db17cb9369c48669cda8a54fe1848b8cfc8bb397f36c6a0953
font_01_sfnt_off0000591c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x591C 19920 bytes
SHA-256: 318d114cafd7cea48f1a11f27c957389fae6c279952253c490b27c84185ff225

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