Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a85bfd5eae6a42a…

MALICIOUS

PDF

36.4 KB Created: 2021-07-06 18:42:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e76193a960fc341d185c38505ccf59de SHA-1: 73b75db7a1af1e1caa9dd8c92be13cc83f6103a3 SHA-256: 1a85bfd5eae6a42afa3f7a3ce383f9759cd79150dcabd28949b5ec05d0c929fd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to known malicious redirectors and potentially malicious PDF files, disguised as game hacks and generators. The document body and embedded links explicitly promote 'free Robux' and 'game hacks', indicating a phishing or scam lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a malicious redirection workflow designed to trick users into visiting harmful sites or downloading further malware.

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/431946152/free-robux-roblox-promo-codes-game-hack In PDF document text
    • https://weddingcards-expert.tw/upload/files/roblox-exploit-super-nice-mml-hacks_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/minecraft-complete-handbook_GM479516143.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/tiktok-free-6-months_GM835599320.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-to-get-free-robux-glitch-with-only-inspect_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/youtubers-that-give-codes-for-robux-for-free_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/hack-mod-coin-master_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/rxfast-ml-free-robux_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-you-get-robux_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-to-get-free-coins-on-tiktok_GM835599320.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/coin-master-spins-for-free_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-coin-master-links_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/counter-blox-roblox-offensive-hack-noclip_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/pain-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-to-get-a-free-bugatti-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3577 22708 bytes
SHA-256: adbe485f336e6583cda7c363573d166220ba745522ceac36eaa8bce7b90ceca1
font_01_sfnt_off0000685d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x685D 19380 bytes
SHA-256: a452d0c191873ed4d1cd88fa82656ca938fba3e74f496bef56901f9d10460b65

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