Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a24838aecd2c3e…

MALICIOUS

PDF

41.7 KB Created: 2021-05-22 09:05:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 65f49a5c27c6b4686f7c60f383ddad1f SHA-1: 19a44ee4df87d27def6b9e49b1836076127f8828 SHA-256: b8a24838aecd2c3e110029cba80f181990951f76d5fd6c232e0c0733bc6584c7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to known malicious redirector infrastructure, specifically promoting "free Robux" or "game hacks". The document body includes text and a call-to-action button to encourage clicks on these malicious URLs. The ML classifier also flagged this PDF as malicious, supporting the assessment of a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8120

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-needed-game-hack In PDF document text
    • http://massimocarpegna.com/images/robux-withdraw_GM431946152.pdfIn PDF document text
    • http://massimocarpegna.com/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://massimocarpegna.com/images/free-robux-games_GM431946152.pdfIn PDF document text
    • http://massimocarpegna.com/images/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://massimocarpegna.com/images/roblox-robux-hack_GM431946152.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
stream_002_off00003000.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3000 26304 bytes
SHA-256: 183a762351b3fc46db479ba2464d96eefcfcf496c21747a9bb336f773266c646
font_01_sfnt_off00006dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DBB 7604 bytes
SHA-256: b4393b16e2c096a269897d1c45a543fc9365713fd2329df9b91235200715c508
font_02_sfnt_off00008029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8029 18776 bytes
SHA-256: d142001b9e8124b93d34dd5eb493ac1502906b177ba9fa7077e4038994baf40d

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