Malicious PDF — malware analysis report

Static analysis result for SHA-256 73947eb43be89370…

MALICIOUS

PDF

34.8 KB Created: 2021-07-20 08:41:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 04543232026c908937e95b187c6faba8 SHA-1: 9949745f35fd0b900f21482c5fe615bc2a17a4a6 SHA-256: 73947eb43be8937078b63179060f7ebe695fecee917e5c5875783e1a9ea6720f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free in-game currency and hacks to trick users into clicking embedded links. The primary link, http://netcdn.tw/app/406889139/coin-master-free-link-game-hack, is identified as malicious redirector infrastructure. The document body contains further links to various game-related cheats and exploits, suggesting a phishing or scam campaign. No scripts were extracted, but the presence of malicious redirectors and lure content indicates a high likelihood of user compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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/coin-master-free-link-game-hack In PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/is-tiktok-free_GM835599320.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/coin-master-free-spin-ml_GM406889139.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_002_off0000300d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x300D 24272 bytes
SHA-256: 31b93e4709b8ad7e2f602cc71ef24fd8a190873bfb7635c5a6be1f2559bf7d2c
font_01_sfnt_off00006761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6761 17880 bytes
SHA-256: 5ce88b684446e36e89a0643934549b22fce1d776877bbe9d9a558feafde7429d

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