Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c83e7f5d5bd8204…

MALICIOUS

PDF

47.5 KB Created: 2021-06-09 06:26:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 38a1a4b009c9ddf6bc183fff9434038f SHA-1: a794d77931d60e059c5786f4a77676242d4afc07 SHA-256: 4c83e7f5d5bd8204b6a75b6652f1bfb1f66900ff1379c5ccdc799b6f66119333
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains numerous links designed to lure users into downloading potentially malicious content or visiting redirector sites, disguised as game hacks and free currency generators. The document body and heuristics indicate a clear intent to drive traffic to SEO link farms and known malicious redirectors, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.tw/app/431946152/roblox-jailbreak-hack-download-speed-game-hack In PDF document text
    • http://asiasieja.pl/images/get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-spin-ml-link_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/how-to-get-tiktok-famous-free_GM835599320.pdfIn PDF document text
    • http://asiasieja.pl/images/robux-in_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/how-to-use-hacks-on-roblox-no-virus_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-working-hack_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • http://asiasieja.pl/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/roblox-free-robux-redeem-code_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/free-robux-no-human-verification-generator_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
stream_004_off000053d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53D3 29280 bytes
SHA-256: 60cc9dc9e7a4bf4f9bdac071971f4249b5ee7b9d91a4eadedb79c61cf0b6cc3b
font_01_sfnt_off000094c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94C0 19152 bytes
SHA-256: 197c20a5322d0edcf4acae13d6d1fcde53ac0c1eded351ac8fddcb673b8c66f4

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