Malicious PDF — malware analysis report

Static analysis result for SHA-256 16499ae0385aa85e…

MALICIOUS

PDF

40.7 KB Created: 2021-05-17 15:04:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f7449c7ae0ef29fc8e9fb0eb2ae7b062 SHA-1: 83f4605e8806e76c3444f1532ff0ae3776d75aa8 SHA-256: 16499ae0385aa85ebd107133bf4201cc3456ec3772573740aeb8742333fb85c4
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a malicious URL, masquerading as a 'free Robux generator' or 'game hack'. This lure is intended to trick users into clicking the link, likely leading to the download of a secondary malicious payload. The document body and heuristics confirm the deceptive nature of the content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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-no-verification-required-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_off000034df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34DF 24892 bytes
SHA-256: 51a0565b9b9efc6f38af2317e96735822acdea8ebbc87ddbba9656f56154eb6a
font_01_sfnt_off00006dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DFA 4048 bytes
SHA-256: 6958112fabc6e095b558487591a3e02a07247346a749a4cd3ef59681e950a992
font_02_sfnt_off00007b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B54 18944 bytes
SHA-256: 3e075e77f873d88a985ea69ac7fafb934745d76ebabdb09bc56e33f005972947

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