Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a45e22dce37715…

MALICIOUS

PDF

39.6 KB Created: 2021-05-20 15:21:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: c0cf0ee0eb0dede619ea1e73fd79d484 SHA-1: 0cbfce2a6ba079b27eaad9c822a1b5180dc66584 SHA-256: 27a45e22dce37715d20d931e3e7240bb1ebd5f5b46df06f6b434e31d68e2c09f
160 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a malicious redirector lure, specifically advertising 'free generators' and 'game hacks'. The embedded URL leads to a known malicious redirector infrastructure. The document body also contains a call to action to access a 'ROBLOX GENERATOR', reinforcing the lure to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

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-or-survey-2021-game-hack In PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/pokemon-go-free-gifts_GM1094591345.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/roblox-online-free-no-download_GM431946152.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/pubg-uc-zong_GM1330123889.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://www.luangtai-ngao.go.th/UserFiles/File/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.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_off00003410.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3410 29240 bytes
SHA-256: 79ca7b0ad2ed236bb30437ddc7137e8788d8d4fbc411f2a6200287b600b94fdb
font_01_sfnt_off0000764d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x764D 19296 bytes
SHA-256: 8ae3a64377bb3499e06ef2dc6ba5ce98d8bac2a4cf46517fa6b68a3eec67b541

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