Malicious PDF — malware analysis report

Static analysis result for SHA-256 314efcfb96b6d41f…

MALICIOUS

PDF

45.7 KB Created: 2021-05-19 22:40:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 941e10b1d64cf048b68653a14dae5c51 SHA-1: bd25c7fee5f88097f72283f8c52cf3b457e239d0 SHA-256: 314efcfb96b6d41f0462c4e37a51e2afbc9e566b7d970ceeb57bd42580879ccf
260 Risk Score

Malware Insights

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

This PDF document contains multiple links to redirector infrastructure, including one specifically identified as a 'free generator / game hack' lure. The document also presents a fake CAPTCHA, suggesting an attempt to trick users into performing an action that could lead to further compromise. The presence of numerous links to external PDFs indicates a link farm designed to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/1330123889/pubg-uc-kaise-kamaye-game-hack In PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/near-tiktok-free-view_GM835599320.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/robux-free-co_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-robux-master_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/coinmaster-spins_GM406889139.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/get-free-spins-for-coin-master_GM406889139.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_003_off000048a9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48A9 30016 bytes
SHA-256: 64bb412de645972ea11542c3ecf6b4abec1a769eee8d84f283b25b2cd1a5d7b7
font_01_sfnt_off00008f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F3D 18688 bytes
SHA-256: f68fde4fe331ff93c877000e6ba0ff18b53374f718746ac93bb7e4937bf3a191

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