Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e5babfb3094df1…

MALICIOUS

PDF

42.0 KB Created: 2021-05-11 17:03:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cd35e16ecde320690491c269653d1acb SHA-1: 6cbdeb407274f918bf335a4827d90d340c41b65d SHA-256: 67e5babfb3094df12d46f94227f72bc2c7366ee0b0db198479255d599880b11a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'free generator / game hack' lure. The document body, though partially corrupted, contains similar URLs and text suggesting a scam. The presence of embedded URLs and the overall structure indicate an attempt to trick the user into navigating to malicious infrastructure, likely to download a secondary payload.

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/master-coin-free-link-game-hack In PDF document text
    • https://www.cow-style.com.tw/upload/files/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-roblox-injector_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-generator_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/info-roblox-com-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-avatar-com_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/make-free-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/hack-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-tracker_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/can-you-give-me-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-hack-spins-game-download_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-app-for-free-spins_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/i-want-free-robux_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
stream_003_off00004a30.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A30 25040 bytes
SHA-256: 56971fdfd2c781ba38c0eacf3b8ff105768fe0a60403e49235a0fc13cc1a7c30
font_01_sfnt_off0000831e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x831E 17880 bytes
SHA-256: f325bc51a5f33ec2ea6c889aa635c0e4104002a1859551a05fb0fcec2a10294b

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