Malicious PDF — malware analysis report

Static analysis result for SHA-256 901caa5f0479732c…

MALICIOUS

PDF

35.2 KB Created: 2021-07-07 01:23:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8eca8bce407753472c8a5479a6a9a82c SHA-1: 49f70df567c5ad0a4cf22bc665c4ee93de8444f7 SHA-256: 901caa5f0479732c9bb173cbeb8c45b4efef8c208628e3f863729dcd5fe559bf
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks. The primary redirector URL is http://netcdn.tw/app/406889139/how-to-hack-coin-master-game-without-root-game-hack, which then leads to other malicious PDFs hosted on vermaagri.com. This indicates a phishing or social engineering attack aiming to trick users into downloading further malicious content.

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/how-to-hack-coin-master-game-without-root-game-hack In PDF document text
    • http://vermaagri.com/uploaded_files/userfiles/files/coin-master-email-rewards-link_GM406889139.pdfIn PDF document text
    • http://vermaagri.com/uploaded_files/userfiles/files/how-to-get-the-ultimate-victory-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://vermaagri.com/uploaded_files/userfiles/files/www-coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://vermaagri.com/uploaded_files/userfiles/files/coin-master-hack-apk-35-18_GM406889139.pdfIn PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/free-roblox-games-without-password_GM431946152.pdfIn PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/free-robux-script-pastebin-2021_GM431946152.pdfIn PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/invited-free-robux-glitch-by-unknown_GM431946152.pdfIn PDF document text
    • http://vermaagri.com/uploaded_files/userfiles/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://vermaagri.com/uploaded_files/userfiles/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://vermaagri.com/uploaded_files/userfiles/files/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://vermaagri.com/uploaded_files/userfiles/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/tiktok-free-up-space_GM835599320.pdfIn PDF document text
    • http://vermaagri.com/uploaded_files/userfiles/files/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/how-to-hack-to-get-money-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • http://vermaagri.com/uploaded_files/userfiles/files/roblox-free-hate_GM431946152.pdfIn PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/113-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.vermaagri.com/uploaded_files/userfiles/files/free-hack-to-get-obc-robloxcom_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003147.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3147 23064 bytes
SHA-256: 7df288687803d1c536610e47f94d014287d294300130655f216c5554e77dbed9
font_01_sfnt_off0000653f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x653F 18932 bytes
SHA-256: 09c7132829cd078d9a38136ec8ce06a43dec18f251ee3210dd6d9bf6bbd0cdcb

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