Malicious PDF — malware analysis report

Static analysis result for SHA-256 3421fed5c3ac0968…

MALICIOUS

PDF

42.7 KB Created: 2021-05-24 15:03:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 78ad4b994cf26cb5a20caffdf3d8a2ff SHA-1: c98614265d7a7c72c7e5db9c44601fa22e7aea4b SHA-256: 3421fed5c3ac0968fbd91d0e1de8cd5be609fa71eab7e597da0dd9e7db791f5b
130 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for 'free Robux' or 'game hacks'. The embedded URL, https://netcdn.xyz/app/431946152/free-robux-codes-game-hack, is identified as a malicious redirector. The document body and metadata confirm the lure and the application used to generate the PDF. No scripts were extracted, but the primary attack pattern is social engineering via a malicious link.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

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-codes-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002c6c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2C6C 30116 bytes
SHA-256: 7836504b1e8dd5db9c8784d84a2913e8c046a95faddf6fa63e77759adb67b453
font_01_sfnt_off00006f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7F 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00007965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7965 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_03_sfnt_off0000860d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x860D 18188 bytes
SHA-256: 7763b0eba74f003993d6ddc379ef756dfeeff7cedd1b34d70c41f8674d393ab3

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