Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca73cf91edca1263…

MALICIOUS

PDF

35.3 KB Created: 2021-07-06 09:35:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3a6ec330b8f2343c9d00b68f6630d4b6 SHA-1: 09b4b199978cec77c76a74cde814c1805a4e23f5 SHA-256: ca73cf91edca12632fa7ef5929813e24816579f7379e397c3d76108b9cd15916
160 Risk Score

Malware Insights

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

The PDF document contains a link to a known malicious redirector infrastructure, disguised as a 'game hack' generator. This lure is intended to trick users into downloading a second-stage payload. The ML classifier strongly indicated maliciousness, and the presence of multiple links to similar lure documents reinforces this assessment.

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/haktuts-2021-coin-master-free-spin-link-game-hack In PDF document text
    • https://www.vadai.sg/uploaded_files/userfiles/files/oprewards-points-generator_GM431946152.pdfIn PDF document text
    • https://www.vadai.sg/uploaded_files/userfiles/files/roblox-hack-scripts-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.vadai.sg/uploaded_files/userfiles/files/robux-xyz_GM431946152.pdfIn PDF document text
    • https://www.vadai.sg/uploaded_files/userfiles/files/village-coin_GM406889139.pdfIn PDF document text
    • https://www.vadai.sg/uploaded_files/userfiles/files/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • https://www.vadai.sg/uploaded_files/userfiles/files/hack-roblox-games-pastebin_GM431946152.pdfIn PDF document text
    • https://www.vadai.sg/uploaded_files/userfiles/files/free-spins-and-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://www.vadai.sg/uploaded_files/userfiles/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://www.vadai.sg/uploaded_files/userfiles/files/roblox-cheat-engine-64-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.vadai.sg/uploaded_files/userfiles/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • https://www.vadai.sg/uploaded_files/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.vadai.sg/uploaded_files/userfiles/files/all-free-roblox-emotes_GM431946152.pdfIn PDF document text
    • https://www.vadai.sg/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.vadai.sg/uploaded_files/userfiles/files/2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.vadai.sg/uploaded_files/userfiles/files/free-robux-mod_GM431946152.pdfIn PDF document text
    • https://www.vadai.sg/uploaded_files/userfiles/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.vadai.sg/uploaded_files/userfiles/files/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • https://www.vadai.sg/uploaded_files/userfiles/files/pastebin-hack-for-robux_GM431946152.pdfIn PDF document text
    • https://www.vadai.sg/uploaded_files/userfiles/files/whats-robux_GM431946152.pdfIn PDF document text
    • https://www.vadai.sg/uploaded_files/userfiles/files/free-spins-coin-master-no-survey_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_002_off00003088.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3088 23344 bytes
SHA-256: 77b72ea4c394d2fb3e27725ad509ae4027c07070148ed6fe9ee58f401c77b82a
stream_003_off00006589.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6589 18884 bytes
SHA-256: 7fbaae8c74c80ad8c6004c185d9f2f033924c4f14cdb292a6e337190a643b689

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