Malicious PDF — malware analysis report

Static analysis result for SHA-256 08cf5a3f20610a73…

MALICIOUS

PDF

40.4 KB Created: 2021-05-20 14:28:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3f9e7b31639d352fe16861d8d8222998 SHA-1: 97ad6199f33f3276c720040ed636cee15f066588 SHA-256: 08cf5a3f20610a73509cb7d30241d5298743a0814352af11e297e5cbe5a17a45
200 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA and a "free generator" lure, as indicated by the 'PDF_GAME_HACK_REDIRECT_LURE' and 'SE_FAKE_CAPTCHA' heuristics. It contains multiple embedded URLs, with a primary malicious redirector at 'https://netcdn.xyz/app/431946152/mobihack-net-roblox-hack-game-hack'. The document's structure and content suggest an attempt to deceive users into clicking these links, likely leading to further malicious content or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7768

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/mobihack-net-roblox-hack-game-hack In PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/pokemon-go-free-90-iv_GM1094591345.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/get-free-spins-in-coin-master_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_002_off000033d8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33D8 27400 bytes
SHA-256: 62093926a3ffe36fcb8d3fccaffc1f6a07b576b347e90c7bc381ffc27bae9b71
font_01_sfnt_off0000719b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x719B 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00007b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4A 18768 bytes
SHA-256: 4038ce5e3e0945c6cd976405ec29b4e5783f739c83bcd68413f286c6b350b233