Malicious PDF — malware analysis report

Static analysis result for SHA-256 db81b82cbe360d87…

MALICIOUS

PDF

37.5 KB Created: 2021-05-20 19:41:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9aff73629f6c4aa63a7c1af51e8c4bbc SHA-1: 8f538292888973980d4bf3c7b8e358bec9b6c1f0 SHA-256: db81b82cbe360d8750caabd14f6e26957a57f95a881308b12217fc374234322c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on them, ostensibly to get free in-game currency. These links redirect to malicious infrastructure, including a known malicious redirector. The document body and heuristics indicate a scam or phishing attempt disguised as a game hack generator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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/406889139/free-spin-in-coin-master-game-hack In PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/get-robux-today_GM431946152.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/get-me-free-robux_GM431946152.pdfIn 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_002_off00003454.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3454 27040 bytes
SHA-256: 492b3f5a4652ea3e8253f6cf055ee3f130afc45778934ec082fd7fd46a95cf96
font_01_sfnt_off000072cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72CC 17884 bytes
SHA-256: d73da77b5a1bbc7a2b5b207bcae6a8efd78ccb1f3c8a04009520d94079973ddb

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