Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b195a65395aef25…

MALICIOUS

PDF

43.1 KB Created: 2021-05-12 08:01:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0f918570155de1fb5f08bf8f6af23e1a SHA-1: 1af8c63e1aadaed79000b0b785de4a12558ddfc6 SHA-256: 4b195a65395aef258f318f294bf1a2bab805ee50e02c958e5663ca4fab8a05a3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and a call-to-action phrase, strongly suggesting a lure for users to click on a link. The primary URL points to a page offering 'Coin Master Daily Free Spins Link 2021', which is a common theme for phishing or malware distribution. The ML classifier also flagged this PDF as malicious with high confidence.

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-daily-free-spins-link-2021-game-hack In PDF document text
    • https://www.yantan.com.tw/upload/files/moon-active_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/minecraft-bedrock-edition-hacks_GM479516143.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/game-toolbox_GM479516143.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-spin-pattern_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/daily-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/earn-robux-now_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coins-master_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/rewards-roblox-com_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/get-free-lives-on-coin-master_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_off000049cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49CC 25496 bytes
SHA-256: a2cb8b95c191aef9285579107d7b67c6c920f711a163b0e43baa4354bac44799
font_01_sfnt_off0000843d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x843D 18880 bytes
SHA-256: 4ccb81aabfc378a65bbb004da1df6276046c1b1923188410bd025f5007717b79

Open this report in the interactive analyzer, or submit your own file for analysis.