Malicious PDF — malware analysis report

Static analysis result for SHA-256 a624555484dd18c0…

MALICIOUS

PDF

44.8 KB Created: 2021-06-07 08:11:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ae8dc69500d5b61090a1e95997f776b6 SHA-1: 11a6f9cde67e0b7ae0ff35132e9f02178b69387f SHA-256: a624555484dd18c0a81775e81525188a3191d6269a247bc605a9d9e17064e26f
130 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'free generator / game hack' lure. The embedded URL leads to known malicious infrastructure, suggesting an attempt to trick users into visiting a compromised site. While no scripts were extracted, the PDF structure and the nature of the lure indicate a phishing or scam attempt, likely leveraging a client-side exploit to achieve its objective.

Machine Learning

  • Nyx PDF Classifier clean score 0.0285

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.tw/app/431946152/open-rewards-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_004_off00003de5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3DE5 28628 bytes
SHA-256: 850e48d96c022ddf457b777ef608232b8af597e4f3d1dc4972b96aba5eeccb76
font_01_sfnt_off00007eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EED 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00008bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFF 18756 bytes
SHA-256: 81b46d0b19ddb06f81c947741ce08823735548bc74e003799629e8da0c7bf1e1

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