Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc2b5cbf51b804a…

MALICIOUS

PDF

37.1 KB Created: 2021-07-19 02:09:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f4a9649d7cf45da8771ded6e83095920 SHA-1: 85aab394f833189ca96c91fdc8076fbad0d0fa04 SHA-256: bfc2b5cbf51b804ade4b74e445a340471b8d41aaef0c515f88215d927a222d3d
160 Risk Score

Malware Insights

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

The PDF contains embedded URLs and text that strongly suggest a lure for free Robux or game hacks, directing users to a malicious domain. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure indicate an attempt to trick the user into executing a malicious payload or visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9600

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/rbl-gg-free-robux-game-hack In PDF document text
    • https://ase-sinaloa.gob.mx/images/free-robux-site_GM431946152.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/minecraft-free_GM479516143.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/free-tiktok-likes-2021_GM835599320.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://ase-sinaloa.gob.mx/images/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3903 23664 bytes
SHA-256: 9c47fbbf13c75f368459a9977ccc8c86080d7a441815390011b437afe646c3be
font_01_sfnt_off00006ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE0 18564 bytes
SHA-256: 58613d845c4ac8afc8e5c0598546d9b082a4cfb9e9fba4292ddf1deb4c958fa3

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