Malicious PDF — malware analysis report

Static analysis result for SHA-256 904423bcfa4364f4…

MALICIOUS

PDF

42.5 KB Created: 2021-05-10 16:20:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 141520531b2ef219ce27389fb82c1e7d SHA-1: a79df02e421a8c4687804f03d6056f51f64f4274 SHA-256: 904423bcfa4364f462016c332ca38d04072bc8814c76d03368dccf6fbcdb6f87
200 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to malicious infrastructure, impersonating brands like Facebook and Roblox to lure users into downloading potentially harmful content. The ML classifier strongly indicated maliciousness, and the presence of redirector links suggests an attempt to deliver a second-stage payload or phish for credentials. No scripts were extracted, but the document's structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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-skin-free-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-skin-free-game-hack In PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/coin-master-pet-food-hack_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/coin-master-hack-tool-access-online-generator_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/free-robux-co_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_003_off000048e6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48E6 25856 bytes
SHA-256: f20aca557896369adac39832fe565659bd30f149d4bb339b26b74c9671edfe11
font_01_sfnt_off00008427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8427 18236 bytes
SHA-256: 6f613c146b2caf8aa71dfdba399286dfcc190b8555f8633d10d72eb14be7938a

Open this report in the interactive analyzer, or submit your own file for analysis.