Malicious PDF — malware analysis report

Static analysis result for SHA-256 10732b5880066a27…

MALICIOUS

PDF

47.0 KB Created: 2021-05-19 07:31:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 592d7a4558aaf59f21741092b8048e65 SHA-1: 638a4fac3216aa5fb2b19a7ac58802317ad8e435 SHA-256: 10732b5880066a278b4434535bb9c07e9ffc7033076d03d1b2fab36d26a4777a
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a malicious URL, disguised as a 'free Robux generator' or 'game hack'. The document body and heuristics indicate a lure to trick users into clicking the link, which likely leads to the download of a malicious payload. No scripts were extracted, but the presence of malicious redirector links and the lure suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0147

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-2021-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_off0000399e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x399E 29136 bytes
SHA-256: a1b9ebedaade2200a234df6213dfacd805992d3edb181b0add66bf5486c72247
font_01_sfnt_off00007dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD0 7420 bytes
SHA-256: 0b188308ab0e7ffce9913d63d697a586f2937cafc51a771db38e3a566cd37e24
font_02_sfnt_off00009640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9640 18416 bytes
SHA-256: a2c808792aaeb1607b9c3a91ae122c662faffffe8d42f3cf4118be6ccc5b3e7b

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