Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bda3d999664b543…

MALICIOUS

PDF

41.3 KB Created: 2021-05-19 09:40:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6e687465c802cd126bcfe74094af1980 SHA-1: 955add90ff5cf4f8e5a32297f58cf9ad68f328e5 SHA-256: 1bda3d999664b5438b25abd2598fcc2d205a014b87447bc9a66e303594997e8d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating a malicious redirector lure, specifically referencing a 'free generator / game hack'. The primary IOC is the URL associated with this lure, which points to known malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'free robux' and a call to action, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/rbxfree-com-free-robux-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_off000034a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34A7 27260 bytes
SHA-256: 10ba15475e87d67e7d53455f77e36c5f6c751aa31530a03c8b51d6d4242fbaca
font_01_sfnt_off00007252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7252 4132 bytes
SHA-256: a5172f00804102352c7e85eeaea151598404d1d1e54346a0277cb36ff2e589b0
font_02_sfnt_off00008047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8047 18276 bytes
SHA-256: 3458f47f0b0e4c5d178391a23bbf01d917f000ba7933fbc297d15d2e5240f022

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