Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a484b7b6d8f7eb4…

MALICIOUS

PDF

30.4 KB Created: 2021-07-19 09:40:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c4220bf41aef1f95ffecd720df2b93ac SHA-1: 476f4887f0dded73757a427020c2edae4686c309 SHA-256: 4a484b7b6d8f7eb45a77c3c539de595d88d69138896f10b0eff6b686f7a23229
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as game hacks and generators. The document body explicitly mentions "Roblox Robux Hack" and "CLICK HERE TO ACCESS ROBUX GENERATOR", indicating a social engineering lure. The ML classifier also flagged the PDF as malicious, supporting the conclusion that this document is intended to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9407

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/431946152/roblox-robux-hack-game-hack In PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/roblox-hack-me_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
font_00_sfnt_off000023f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23F5 21832 bytes
SHA-256: 189358c132c6e1fc882f6ee3227adc5a76e2e37e0718aa245fd95cdd5e40b8fa
font_01_sfnt_off00005451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5451 18508 bytes
SHA-256: 4668884a5238ce392f70cf6270cdd41fb4d04f02843369cb50cdd53041a5b0b7

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