Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a10513a2ce7a898…

MALICIOUS

PDF

33.7 KB Created: 2021-07-07 23:39:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5aebb8dcec635102ffe9f1710004cd9b SHA-1: d4d9475fc54f6ea8fc65838637432bb04e6c5779 SHA-256: 1a10513a2ce7a8982581a7565ec7e54406f19fec8fc1a5b4d39f6a5daa7f2ef7
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including a primary redirector URL, that masquerade as game hacks and generators for popular games like Coin Master and Roblox. These links likely lead to malicious websites designed to trick users into downloading further malware or engaging in scams. The presence of a malicious redirector and a large number of SEO-optimized PDF links indicates a coordinated effort to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-34-4-hack-game-hack In PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/earn-robux_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/roblox-assassin-hack-2021-read-desc_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-hack-no-verify_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/robux-generator-free-no-password-no-verification_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/roblox-bot-free_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/scary-larry-roblox_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/life-in-paradise-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-roblox-printables_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/wurst_GM479516143.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/roblox-free-rubox_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
font_00_sfnt_off00002dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DFD 22688 bytes
SHA-256: 4c4be84411fe0c71525c7089d6c20a9ece405b172fae36871e4f8bf918f9ace4
font_01_sfnt_off000060c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C7 18240 bytes
SHA-256: c6a603a236db465a7556ab6a5027bd55d5ce2b4fe35e46119782d363115cdd6f

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