Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f139c24e304cbe5…

MALICIOUS

PDF

42.2 KB Created: 2021-05-14 02:13:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6ae393642ce37bf49153fe24a9b56a26 SHA-1: 84848a7495a403ce7e09d18e3c2bdd73642f2d95 SHA-256: 8f139c24e304cbe50da4a9f0edd8ba16c9779a778bd3df0e7a7674b1353adffa
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, masquerading as game hacks and generators. It impersonates brands like Netflix to increase user trust and encourage clicks. The embedded URLs likely lead to further malicious content or phishing pages, indicating a credential phishing and potentially malware distribution campaign.

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/getrobux-now-game-hack.
  • 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/getrobux-now-game-hack In PDF document text
    • http://eltisstudio.sk/images/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-game-hack-online_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/roblox-devil_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-35-2-hack_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/village-coin_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/roblox-but_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-hack-spins-game-download_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-hack-mod-apk-download_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-free-spins-bit-ly_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_off00004906.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4906 24884 bytes
SHA-256: 9de02d1d4cf0f7c0bf03a17aede4e2bd45ccbd1c6961ce419d710a17bfe232d1
font_01_sfnt_off000082c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82C0 18120 bytes
SHA-256: de6bc5a2c3ccfe8cd092df1e0cd700ba4b2d067c0892dbade0599f643b41633a

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