Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b28a3b402513c2e…

MALICIOUS

PDF

42.7 KB Created: 2021-05-13 17:53:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6f6dca39d091c364f6ca392ba6609827 SHA-1: f05198c39545d35e871249adf2d946d58209000e SHA-256: 9b28a3b402513c2e0e79b463232a82cadd2ff9c602ca67d52e025f99538ef78b
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to redirector infrastructure, masquerading as game hacks and generators. The presence of a fake CAPTCHA heuristic suggests an attempt to trick the user into performing an action that could lead to further compromise. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/406889139/free-games-coin-master-game-hack In PDF document text
    • http://technologicalsc.com/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://technologicalsc.com/images/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://technologicalsc.com/images/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://technologicalsc.com/images/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://technologicalsc.com/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://technologicalsc.com/images/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://technologicalsc.com/images/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
    • http://technologicalsc.com/images/free-100-robux_GM431946152.pdfIn PDF document text
    • http://technologicalsc.com/images/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://technologicalsc.com/images/apps-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://technologicalsc.com/images/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://technologicalsc.com/images/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://technologicalsc.com/images/robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://technologicalsc.com/images/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://technologicalsc.com/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://technologicalsc.com/images/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • http://technologicalsc.com/images/get-robux-com_GM431946152.pdfIn PDF document text
    • http://technologicalsc.com/images/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://technologicalsc.com/images/free-roebucks_GM431946152.pdfIn PDF document text
    • http://technologicalsc.com/images/coin-master-free-coins-link-facebook_GM406889139.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_003_off000049bf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49BF 26036 bytes
SHA-256: 6c88b08a1a32c7a9df493c7eed654fea8d447358c69163abdb4b3eb85cbd8073
font_01_sfnt_off0000859d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x859D 17968 bytes
SHA-256: 5fada2ff63ba62223632bc56e8dfb1643a49e6b45897fd934634a5dc4cc15e02

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