Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87ff1c0147ade81…

MALICIOUS

PDF

39.2 KB Created: 2021-05-11 15:30:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 40fee539e254ea92eef5e13c0816dc13 SHA-1: d3d00d953276b71a0a492845e0c3b10dea5beb23 SHA-256: e87ff1c0147ade81c76b00c647ca37f1ae548798dc0196e47ec4220ec8f64fc9
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically promoting a 'game hack'. The heuristic firings indicate a lure for a 'free generator / game hack' and a malicious redirector. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection, likely leading to a further stage of infection or phishing.

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/406889139/archery-master-3d-unlimited-coins-hack-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_off00003539.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3539 24412 bytes
SHA-256: 84465b4bb5636d6d92b83c0a3430cc3c759c967535d5c60c24c4497b7362bdaf
font_01_sfnt_off00006c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4E 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000075ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75FF 18928 bytes
SHA-256: 68a1d49791257d9f2ad602f5d41fb7369be842eea3b9c5f87e4c238e71419427

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