Malicious PDF — malware analysis report

Static analysis result for SHA-256 a805bd21c1d1d28d…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 01:29:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9a8c29513aa9300124362bc9f4893cc6 SHA-1: b4803804282a39dd3939487494a0edabec0cc4be SHA-256: a805bd21c1d1d28d9fc1e8f9f3f1abb80ac4d411475596ad79e02d57a243c365
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure of free game hacks and Robux to entice users. It contains numerous links to redirector infrastructure and SEO link farms, indicating a phishing or scam campaign. The primary malicious URL identified is http://netcdn.tw/app/431946152/funbloxxyz-free-robux-game-hack, which is associated with known malicious redirectors. No scripts were extracted, but the document's structure and embedded links strongly suggest a social engineering attack.

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/funbloxxyz-free-robux-game-hack In PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/free-gravity-coil-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/tlcharger-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/minecraft-mod-menu-apk_GM479516143.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/redeem-roblox-cards-free-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/how-to-get-free-robux-without-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/best-free-clothes-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/roblox-lumber-tycoon-two-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/free-game-points-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/robuxian-youtube-page-secret-claim-free-robux-robuxianyoutube_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/cheat-bubble-gum-simulator-de-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/robuxian-com-free-robux-code-generator_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stietenggarong.ac.id/repository/free-mobile-360-free-robux_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_off00003218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3218 21688 bytes
SHA-256: bf8f3ccdd48918138a656b82f7d748da3b366643552ba19576584c38f06e2fcd
font_01_sfnt_off000061df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61DF 19052 bytes
SHA-256: b8da4c12b443ea16a452d57305b0b851670a4d0bed79603d1953fd1acd138761

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