Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f46d2f12dfab04…

MALICIOUS

PDF

49.0 KB Created: 2021-05-16 14:30:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9f727aae95a8c1841d9c19b55500b25c SHA-1: 2fa05d0b5e49c4c54e6c39b7c41ab525e17024e4 SHA-256: 91f46d2f12dfab040c3662e494ae348d27a4e02f3e28626a926c83fe6a38c1b4
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links pointing to a known malicious redirector infrastructure, disguised as a 'free Robux hack'. The document body explicitly mentions 'Free Robux Hack Us' and 'CLICK HERE TO ACCESS ROBLOX GENERATOR', indicating a social engineering lure. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites, likely for further payload delivery or phishing.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3155

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.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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-hack-us-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_off000032b7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32B7 25156 bytes
SHA-256: f1a43012ac9aa06266c2cce2eb539d8c96749f52a7890b599eb80380f784c3eb
font_01_sfnt_off00006cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CEF 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00007997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7997 18600 bytes
SHA-256: be32b0f906764c1f2317decc7ac5a24a5975e1ace61028a3a9703984df87bb8b

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