Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa98afa513f8dfd…

MALICIOUS

PDF

35.8 KB Created: 2021-07-05 01:50:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 017a367a8d667cddef20b8abcf1bc534 SHA-1: 56afe07825e3b821334731ea921a32efda805e39 SHA-256: caa98afa513f8dfd3f0eddda4ed5a15a9243de63fb210644fee513da5f456355
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure and websites promising free game currency or hacks, indicating a social engineering lure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the presence of known malicious redirectors. Although no scripts were explicitly extracted, the document's structure and embedded links suggest it is designed to drive users to external, potentially malicious, content.

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/406889139/how-to-get-free-spins-for-coin-master-game-hack In PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/coin-master-date-and-time-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/free-promo-codes-for-gear-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/free-robux-ad-website_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/hack-coin-master-game-apk_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/iluminate-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/robux-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/como-hackear-coin-master-gratis_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/free-clothes-on-roblox-image-shirt_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/texte-pour-hacker-des-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/how-to-get-free-robux-by-using-cookies-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/roblox-its-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/free-shirt-design-maker-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/coin-master-hack-online-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/hack-de-robux-en-roblox-espaol-en-3-minutos_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/how-to-get-free-clothes-on-in-roblox_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_off0000350c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x350C 23056 bytes
SHA-256: 9a515d40ab02a8410834f489a3a6370aa6bf0f59cde87c6153ebae57b9e2ba5b
font_01_sfnt_off00006903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6903 18336 bytes
SHA-256: 23f71a9ba4d854b783c042dde3b810d75211435ebb04f16eb6963276a01a3aa2

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