Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8913f90ac1003c…

MALICIOUS

PDF

38.9 KB Created: 2021-04-28 15:10:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5a6a38995db075aa55abb6fda68660c5 SHA-1: c44d7c90f2789c3bedcd3035a6ddd6593ea57ce1 SHA-256: dc8913f90ac1003cb087705ad6ecfec8ea7162230f08a3605c041f8170ab9dbc
138 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating a malicious redirector lure, specifically advertising a 'free generator / game hack' for Roblox. The embedded URL, https://netcdn.xyz/app/431946152/free-roblox-accounts-with-robux-list-game-hack, is flagged as malicious. The document body, though partially corrupted, also contains references to this URL and a call to action, reinforcing the lure. The primary attack pattern involves tricking the user into clicking the malicious link, which likely leads to further compromise.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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-roblox-accounts-with-robux-list-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_off000036f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36F5 27276 bytes
SHA-256: 42abe7034604dcde6f7eb0618f749426c7ecc93f669fe977d79f0b80cc7efc01
font_01_sfnt_off000075a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75A9 18676 bytes
SHA-256: d60ede061cfc991c31b321dfd27377d3a0e4a537d079dadf5a14f47e5e827f15

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