Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8b1e5c1c215b2a…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 11:03:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 615051a22640a50c02b9fa67ff25da30 SHA-1: 463579436f028f85f6498634f0fe37271daa6239 SHA-256: 1d8b1e5c1c215b2ac158c29ed3358fe329f47e9543ec3675d5e6974c1eae2b00
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of game hacks and free in-game currency to trick users into clicking malicious links. It contains numerous links to redirector infrastructure and SEO link farms, designed to lead users to potentially harmful content. The document body and heuristics indicate a clear intent to drive traffic to external, untrusted sites, likely for further exploitation or malware delivery.

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/431946152/roblox-hack-unlimited-robux-game-hack In PDF document text
    • http://opac.acehresearch.org/repository/how-to-get-free-robux-using-codes_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/coin-master-hack-android_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/how-to-get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/coin-master-hack-tips_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/coin-master-hacker-club_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/minecraft-free-online_GM479516143.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/how-to-get-free-robux-no-hack-or-download-2021_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/jailbreak-robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/games-that-can-be-hacked_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-t-shirt-roblox_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_off00002db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DB8 22696 bytes
SHA-256: 7c1ed383f380b0d6c880bf4fc631cd3b78f3a7730d6ac069453306bf729b7893
font_01_sfnt_off00006079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6079 19452 bytes
SHA-256: c21e99ebfc9f7e5f39e71a68abf279300e15561c35a4934f0c8f70bb34e99d3b

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