Malicious PDF — malware analysis report

Static analysis result for SHA-256 a756c56333d4f99d…

MALICIOUS

PDF

37.8 KB Created: 2021-05-11 20:01:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fa7e518169d391457d23d366a240df4d SHA-1: 8b0b6bc6770cc21957abf507d7c60d62e89cd068 SHA-256: a756c56333d4f99d984950be3d8bd44a97f1f15a0cd6e545008146a5f4faf5cf
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically advertising a 'free generator / game hack'. The document body, though heavily obfuscated, contains references to the malicious URL and appears to be a lure for users seeking in-game currency. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0313

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 https://netcdn.xyz/app/406889139/links-to-get-free-coins-in-coin-master-game-hack In 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_off00002f01.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F01 33248 bytes
SHA-256: 35a6a0f9b491072ed9b1dbec995996f38dba271bf6fcb610423aba36907406b5
font_01_sfnt_off000073e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73E0 17880 bytes
SHA-256: 6ce9208e74195ec5a9110919f623d15dc0b2cedde82057101de8690cf454e309

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