Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3dafa1159046c9…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 06:12:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 137c93a401c7df466d54f66a185e9e66 SHA-1: 58fcd8635e3b2d5071fd7b3511bc84bc123eafd2 SHA-256: 2a3dafa1159046c910f989bf3120d3283464ff1948d4c01acd3895c5bf01c0ba
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure promising free game items, which is a common tactic for phishing or malware distribution. It includes a link to a known malicious redirector, http://netcdn.tw/app/406889139/free-spins-for-coin-master-2021-game-hack, which likely serves as the initial stage for delivering a payload or redirecting to a phishing site. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence score indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-spins-for-coin-master-2021-game-hack In PDF document text
    • http://croatia-flyfishing.com/files/is-minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/roblox-online-free_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/minecraft-java-code-free_GM479516143.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/free-roblox-printables_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/http-bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/coin-master-cheats-for-free-spins_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/pig-master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/free-card-collection-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/coin-master-heaven-daily-free-spins-and-coins-links_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/free-robux-100-working-no-verification_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/roblox-hacks-hub_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/2021-no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/free-robux-generator-2021-no-human-verification_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000326e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x326E 22208 bytes
SHA-256: 1eab4c9b3687ccf2afe55f2c89d6a1577fd1d0a4f64219e485a52d9e638a7f94
font_01_sfnt_off000063a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A4 18576 bytes
SHA-256: fb0fb59ed2c1a9034e606a4b9af272ef40c933264071e94cfd5fd7ab3c408864

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