Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae970cff919baa39…

MALICIOUS

PDF

37.3 KB Created: 2021-05-10 12:33:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1a43fbb6b3cd9ab0145fcd8b3363b1ed SHA-1: c8dff8b471075092a7dc4df0c7848ec5a7b0e225 SHA-256: ae970cff919baa39be34ab16b84c9e44f9bf5d2cc509dbe14dd18ba4e454fdfb
170 Risk Score

Malware Insights

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

The PDF document contains a lure for a "free generator" and displays a fake CAPTCHA, aiming to trick the user into clicking a malicious link. This link, 'https://netcdn.xyz/app/406889139/2021-free-spins-coin-master-game-hack', is identified as a malicious redirector. The document body also contains embedded URLs and text related to the lure, reinforcing the social engineering aspect.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/406889139/2021-free-spins-coin-master-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_off00003579.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3579 25856 bytes
SHA-256: 412e8025230ab64bcd4e82f3ca1305e94240d8844caed82763fce4f352224ffc
font_01_sfnt_off00007090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7090 18288 bytes
SHA-256: d5a46c40ddaffffdec7b194e78d64597afed9f46b5e12e45e50a00bb771aa4a6