Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d90814a33adfdd6…

MALICIOUS

PDF

35.6 KB Created: 2021-05-10 22:15:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cb411b695d3100e1d95df6c04330fecd SHA-1: ac753f14d718b09d44a55c52e1de86521231d742 SHA-256: 7d90814a33adfdd64cf57f5d901889d06b2c5d0c5ba162501f6dc097cc081b9e
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded links that redirect to known malicious infrastructure, specifically advertising a 'free generator' or 'game hack'. The document body and heuristics indicate a lure to trick users into clicking these links. While no scripts were explicitly extracted, the nature of PDF redirects often involves JavaScript execution to facilitate the redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier clean score 0.0265

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/como-hackear-coin-master-iphone-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_off00003203.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3203 24360 bytes
SHA-256: ae6845964180f728041f04f096524c9755db3d01f9bd1f5c6a24ba5815329769
font_01_sfnt_off000069e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69E1 18316 bytes
SHA-256: 06561d1fe781349ebc89ed81d119ef5c9c3ee7c50d91a6ac0924a9774f8ddcd9

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