Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b85a8f4e2248a8…

MALICIOUS

PDF

41.5 KB Created: 2021-05-17 09:49:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 720454219e95d983ee4c9217b614ff34 SHA-1: 2ac9ea4d7269377081a04195af6e98a7863fc3e8 SHA-256: 87b85a8f4e2248a8307e83f0a62af47187642bd237d863caf42d2ae2a35e74ff
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting "game hacks" and "free generators". The primary lure URL is https://netcdn.xyz/app/406889139/coin-master-free-chest-link-game-hack. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the heuristic firings suggest malicious redirection and lure tactics consistent with phishing or scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/coin-master-free-chest-link-game-hack In PDF document text
    • http://advancedaudiosystems.org/images/how-to-get-free-hats-on-roblox_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/roblox-g_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/free-robux-website_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/coin-master-100-spin-hack_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/coinmaster-spin-ml_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/coin-master-free-spins-and-coins-today_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/get-free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/earn-points-for-robux_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/app-store-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/does-coin-master-hack-work_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/free-spins-and-coins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/open-coin-master_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/coin-master-unlimited-spin-hack-apk_GM406889139.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47C6 25040 bytes
SHA-256: 57df6ac4214c9786b332cf5cfc16f60519cf04eac8f7d91d5f8ee55ffc234968
font_01_sfnt_off00008081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8081 18048 bytes
SHA-256: 122f27be2a08f4c3092db92943aab7c4ba84ce785d8466f49daf08684c118ae5

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