Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5b97ffd0990173…

MALICIOUS

PDF

35.2 KB Created: 2021-06-28 08:53:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b8600bccb0c64a9eae09dca4a20604a2 SHA-1: bb000f9f080d249556ad7618da0405a0f2081800 SHA-256: ed5b97ffd0990173494827be9922ec141cc90758f246d4e08711a37d301d3c78
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'robux generators' to lure users. The heuristic firings confirm that the document links to known malicious redirectors and employs a common lure tactic. While no scripts were extracted, the embedded URLs and the nature of the lures strongly suggest a phishing or scam attempt designed to lead the user to a malicious site.

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.co/app/431946152/hacks-de-roblox-para-descargar-game-hack In PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-enable-the-free-models-searcher-in-roblox-studiuo_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-printables-free_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-hack-roblox-to-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-roblox-account-generatorold-account-spiiltz-rico_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-roblox-acount-genrator_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-account-taker_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-hack-with-cheat-engine-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-robux-in-script_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-free-wings-hack_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-daily-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/spin-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/synapse-roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/casual-shirt-girls-roblox-template-free_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-400-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-money-hack-free_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_002_off0000327f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327F 22460 bytes
SHA-256: ef9228288bda9f4c17aab9df2e17f850da1acfbcc024db4b3a27100beacae13c
font_01_sfnt_off0000648f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x648F 18980 bytes
SHA-256: b5f7ef34fb301f37b9613f73c1bb185ea934c8e9c21cc24936e1466ec5903d1d

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