Malicious PDF — malware analysis report

Static analysis result for SHA-256 840f6abec6c6768b…

MALICIOUS

PDF

38.2 KB Created: 2021-05-20 19:16:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9f276a5c52011e8544e46fb27514eaef SHA-1: d4a080faccd90ce1957fb0334d6174cd40c5127c SHA-256: 840f6abec6c6768b18e8c751340f6c046a629d62ca3503dd24fafff685e8ea2a
160 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to known malicious redirectors, specifically advertising 'free Robux' or game hacks. The ML classifier also flagged this PDF as malicious. The embedded URLs and the heuristic firings strongly suggest a social engineering lure designed to redirect users to potentially harmful content or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9407

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.xyz/app/431946152/free-robux-apk-game-hack In PDF document text
    • http://chartsmart.com.au/images/how-to-buy-pubg-uc-in-india_GM1330123889.pdfIn PDF document text
    • http://chartsmart.com.au/images/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://chartsmart.com.au/images/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://chartsmart.com.au/images/coin-master-game-hack-apk_GM406889139.pdfIn PDF document text
    • http://chartsmart.com.au/images/can-you-get-robux-for-free_GM431946152.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
stream_002_off000032cd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32CD 29708 bytes
SHA-256: d7faef89c9712d144454b56e6885c5017827b5c411d3d88f7fdd8aa75253cf6e
font_01_sfnt_off0000740f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x740F 18360 bytes
SHA-256: e9359734bc9145e2b26d31ba7f580aebc3bf98c57002eb6e857d81b76a5cddb9

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