Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a4642daeb07635…

MALICIOUS

PDF

27.4 KB Created: 2021-07-05 06:14:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b1b9b213f5dc30b75dca052078053015 SHA-1: 69905b04dd7d3d509bbbbbdb57c0c682503c3914 SHA-256: e1a4642daeb0763536770b953cb70e7f3684c0e7a262b116f9de00a602e3e5e4
130 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a game hack lure, redirecting to known malicious infrastructure. The document body also contains the malicious URL and a call-to-action phrase. While no scripts were extracted, the presence of a malicious redirector indicates an attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0330

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 http://netcdn.tw/app/431946152/blackberry-hacks-roblox-game-hack In PDF document text
    • https://www.roblox.com/.IIn 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
font_00_sfnt_off000018ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CE 21616 bytes
SHA-256: 44dd8587db1a9f2926ff97425e6fb4f28eeeb0f4ae836a6a300da0cecea2cc80
font_01_sfnt_off00004855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4855 18652 bytes
SHA-256: 2132632c054f29a399206234d9d2c7286bd383c611459d91c75cbbacb71e6931

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