Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a25039dbc5cebf…

MALICIOUS

PDF

38.7 KB Created: 2021-05-24 04:21:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2040b8a8e6403e7f7934f53cfeab0881 SHA-1: 5608f17b64757f910f711d8e7901c5a14432e2c5 SHA-256: 45a25039dbc5cebfdd75cb543ea95cdca88136759ea7bcc2b717f82095dd0458
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and generators. The document body explicitly mentions "Roblox Hack Client" and "CLICK HERE TO ACCESS ROBLOX GENERATOR", reinforcing the phishing lure. The ML classifier also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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/roblox-hack-client-game-hack In PDF document text
    • http://zercalo.org/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/roblox-girl_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FFC 24540 bytes
SHA-256: 92625e5d9e1aaaf22679cd9625520a89a0d019a0f3319f1de52d1146dc823da1
font_01_sfnt_off0000687d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x687D 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00007525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7525 18408 bytes
SHA-256: 550f62bb1f49814ef42b1b735b63b4edf215944f9d7482118736a3d91d594bfc

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