Malicious PDF — malware analysis report

Static analysis result for SHA-256 84342ed94cdfe01c…

MALICIOUS

PDF

34.5 KB Created: 2021-07-07 23:40:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 47012f1755c4fd03c31251bb190dbdb9 SHA-1: 6a16b2a0dc7460af633d3f4613a5a7a7d7fa7232 SHA-256: 84342ed94cdfe01c8d6bb6378af5e79dd13f638e4e98699b80f0cd4c9607a062
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, specifically advertising 'free generators' or 'game hacks' for popular games. The primary lure URL is http://netcdn.tw/app/406889139/hack-coin-master-without-verification-game-hack, which is flagged as a malicious redirector. The document body and embedded URLs suggest a social engineering tactic to trick users into downloading further malicious content. No scripts were extracted, but the overall structure points to a downloader or redirector pattern.

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/hack-coin-master-without-verification-game-hack In PDF document text
    • http://foo.com.tw/files/how-to-get-free-robux-without-logging-in_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/obbys-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-games-coin-master_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/dominus-roblox-free_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-claim-generators_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-my-boyfriend-cheated-on-me_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/download-cheat-roblox-pc_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-spin-and-coins-free_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/code-free-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/tiktok-minecraft-hacks_GM479516143.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
stream_002_off00002f8b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F8B 22968 bytes
SHA-256: dcaba2d4e8b521a306abbad533a753a0ce951e77fd82d85689eb91cb8d678608
font_01_sfnt_off00006321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6321 18640 bytes
SHA-256: 559508295b341e167f22e0d2b3b81b0b04bdc2e4d78f98c2e91d6d027a190132

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