Malicious PDF — malware analysis report

Static analysis result for SHA-256 e616f76ead0c5b23…

MALICIOUS

PDF

45.4 KB Created: 2021-05-13 10:34:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8351bff0a6f894e6939753c4ea54514c SHA-1: a07e1bf31774fcb57e30c1b12485bb55480c910a SHA-256: e616f76ead0c5b23ee4cde835cfdc40d3e6447d20865e9fa92b3084ea4c47acf
200 Risk Score

Malware Insights

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

This PDF document contains multiple links impersonating Microsoft and promising free game currency or hacks, which is a common lure for credential phishing. The primary link directs to a known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through deceptive content, likely leading to credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/roblox-inappropriate-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/roblox-inappropriate-game-hack In PDF document text
    • http://fs4sms.com/images/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/play-games-for-robux_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://fs4sms.com/images/free-minecraft-windows-10-account_GM479516143.pdfIn PDF document text
    • http://fs4sms.com/images/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://fs4sms.com/images/coin-master-apk_GM406889139.pdfIn PDF document text
    • http://fs4sms.com/images/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://fs4sms.com/images/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/coin-master-golden-cards-hack_GM406889139.pdfIn PDF document text
    • http://fs4sms.com/images/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/avatar-the-last-airbender-roblox_GM431946152.pdfIn PDF document text
    • http://fs4sms.com/images/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
    • http://fs4sms.com/images/minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://fs4sms.com/images/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000482e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x482E 26360 bytes
SHA-256: 359c1a3becb6346881ac9ed8a47d87157ac4454dfef3a061713f7100785493b7
font_01_sfnt_off000084d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84D3 2836 bytes
SHA-256: fd98c8f6e7c2e74bbd5822409159a93ac5c94da083ae4c2eb269d4284375f9e8
font_02_sfnt_off00008e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E79 18412 bytes
SHA-256: bf685174d95750e966879b9f3e909b67ba6c4a84916aa97962856bc55bc72393

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