Malicious PDF — malware analysis report

Static analysis result for SHA-256 de54fc521a273145…

MALICIOUS

PDF

48.7 KB Created: 2021-05-10 16:34:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6c6de60dca419e8fd7a09d6c67ecada4 SHA-1: 357b910e56e7f798652fcf3e6207688d25cea069 SHA-256: de54fc521a273145e924307be002917d72bef31a2901fa60aef480e619cc739b
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and sites offering game hacks and currency, such as 'https://netcdn.xyz/app/431946152/free-hair-roblox-game-hack'. The document body explicitly mentions 'Free Hair Roblox' and includes a call to action to access a 'ROBLOX GENERATOR', reinforcing the lure. The presence of numerous embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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-hair-roblox-game-hack In PDF document text
    • http://dialine.cz/images/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://dialine.cz/images/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/hack-coin-master-game_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/free-robux-real-2021_GM431946152.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_off00004420.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4420 27164 bytes
SHA-256: 6ac225d63c4bd0fd6766986611a09aac843d1bf388230a87fa081bbf54777d6d
font_01_sfnt_off000083ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83CE 7580 bytes
SHA-256: dad6adaa58c55e1f80e5b8558c574a94486efcb3def8aed14fbb267e9c5fcecb
font_02_sfnt_off00009cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CCE 18296 bytes
SHA-256: a0599e440df83d1220524ed19e510b9c2f6a3db0fbd0aff9e889db947f6eea7b

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