Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68ed313bac9bc96…

MALICIOUS

PDF

36.9 KB Created: 2021-05-17 06:34:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e36e4f148b4fefe03f56cbe646494a03 SHA-1: ab2e86d10ce2fc97999faaaa06680302bf928d5f SHA-256: a68ed313bac9bc96db7cd74fe6e0bc7b2aedafeb0d87fdcef9c5734903e5ea21
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links pointing to malicious redirector infrastructure, specifically advertising a "Free Robux Com Roblox" generator. The document body also contains a call-to-action phrase, reinforcing the lure. The primary IOC is the malicious URL used for redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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/431946152/free-robux-com-roblox-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_off000032f7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32F7 25676 bytes
SHA-256: 2c934447531bfd0a3f08699304b22471d0e658302de739db365219491dfa8d7c
font_01_sfnt_off00006ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE5 18348 bytes
SHA-256: 0a91f6cfdfc59c313b80ddaaf1db47d93b267e297f9a4be9f2abca10b90eba79