Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd70b56ea5eb81a8…

MALICIOUS

PDF

38.9 KB Created: 2021-05-19 13:11:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f9c3e935b8b6c45c363bb41248f289c9 SHA-1: aeeb79450190dd4a8cb32a8024d2805fd653a066 SHA-256: fd70b56ea5eb81a875acc7ef36d054e3b62a5c24cc7c834a747544094f0b5058
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that point to a known malicious redirector infrastructure. The document body text and heuristic firings indicate a lure for a 'free generator' or 'game hack' related to a popular mobile application, designed to trick users into clicking the malicious link. No scripts were extracted, but the presence of malicious links strongly suggests the intent to redirect users to a site that likely hosts further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier clean score 0.0127

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/835599320/without-tiktok-free-view-iphone-11-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_off00003185.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3185 25868 bytes
SHA-256: 1fcecb7164b422bc0cf507c6c3e0e22a4eccf7bdf9712eb181017e32f4418bdf
font_01_sfnt_off00006baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAA 2912 bytes
SHA-256: 02b35010e2614e3cc95ac6414c49295350c91fdfcc4b4cad27ffdbc10e80df7f
font_02_sfnt_off000075a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75A7 18540 bytes
SHA-256: 9447ddea834e3d5a3ed2562486b9a0eb8dba7e300e17b7fb895f737aaeaf5cec

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