Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11672cac3118f24…

MALICIOUS

PDF

40.1 KB Created: 2021-05-13 13:15:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6a1ec3fc97390cbf3ece0faece1c4e90 SHA-1: f0b8d793fded5bbd7414e60cf07adf00fbb821fd SHA-256: c11672cac3118f246ddfdd92c30f74853ac7b82d706a82cd0a9ad299ba93c80b
130 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a lure for malicious redirectors, specifically advertising a 'free generator / game hack'. The embedded URL, https://netcdn.xyz/app/431946152/free-roblox-accounts-dantdm-game-hack, is flagged as malicious infrastructure. The document body also contains similar text and a call-to-action phrase, reinforcing the phishing attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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/431946152/free-roblox-accounts-dantdm-game-hack In 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_off000032c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32C1 27800 bytes
SHA-256: 2587097492d216b443f437837c87d799abe3a288d8efcc6863dc1f4f165cbaed
font_01_sfnt_off00006f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4A 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off000078fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78FB 19020 bytes
SHA-256: fab1cdea1c90721c250ad49de139f00c3e6c4251d6a59756d793536ca2bf5ae4

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