Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97f5a2bba5c36b0…

MALICIOUS

PDF

46.1 KB Created: 2021-05-17 08:15:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 98fa6d1d0363f2558f0ec3c583c92886 SHA-1: 5125235bba57cd316667ac88c79c22a7288e2f4c SHA-256: a97f5a2bba5c36b059e4adf2dabd2b38a9f67e90d30e75d7ee803269357b35ae
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure. The document body and heuristics indicate a lure for game-related cheats or hacks, designed to trick users into clicking through to potentially malicious sites. The presence of multiple SEO-optimized PDF links suggests an attempt to create a link farm for traffic redirection or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 5

  • 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.
  • 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/431946152/free-star-codes-roblox-game-hack In PDF document text
    • http://www.kcmconsulting.com.au/images/how-to-get-free-coins-in-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/free-roblox-wings_GM431946152.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/coin-master-official-page_GM406889139.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/coin-master-free-spins-2021-app-download_GM406889139.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/roblox-free-download_GM431946152.pdfIn PDF document text
    • http://www.kcmconsulting.com.au/images/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004aa2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AA2 26420 bytes
SHA-256: 0ab34226b85a6b0d320f75010c19c61e1628fd95c8708b69b0ba8d5c0eecc54e
font_01_sfnt_off00008743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8743 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off000090f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90F3 18456 bytes
SHA-256: e0fd33c50d9e2ad93d9aab52f856c44adae9b6ad9d7cb110af9757aef404b6ba

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