Malicious PDF — malware analysis report

Static analysis result for SHA-256 a734d905e3178d2a…

MALICIOUS

PDF

40.4 KB Created: 2021-05-20 00:08:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fe040097ecd9edd901452edc06a1d8af SHA-1: 4f37c0d2d198d9aed350bd5530a5981031537918 SHA-256: a734d905e3178d2afbe9cb1285daaa817adb7779d4a021b7d9f5e713cb27599c
130 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating it's a malicious redirector lure, specifically targeting users with promises of game hacks. The embedded URL leads to known malicious infrastructure. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest an attempt to drive users to a malicious site for further exploitation or malware delivery.

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/1094591345/without-pokemon-go-free-pokeballs-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_off0000344c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x344C 24796 bytes
SHA-256: e77e87e3cbdfca71976c57712809f5e193ccb9c99651cfe0938d96bac3a1284c
font_01_sfnt_off00006d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D9A 3636 bytes
SHA-256: 99dd96e89babb04aea0f0ebf99e33ebde901eaa524a16077e4ca0928c8dd6ae0
font_02_sfnt_off00007a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A66 19032 bytes
SHA-256: e097c26ba54979f4629cb9565d58c03afc0c36cbf88c932ea6ab5b3e31a4e482

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