Malicious PDF — malware analysis report

Static analysis result for SHA-256 859402767e14e6b4…

MALICIOUS

PDF

34.5 KB Created: 2021-07-02 01:10:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1fa4b29035a5de9396679b8a9b3e9171 SHA-1: 03975969fa73077eb8ef6122120764f0812bb926 SHA-256: 859402767e14e6b40f978ab0a37d9fb7f5fe726ea776080e9d83a90d1ed0d285
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one to a known malicious redirector, disguised as game hacks and generators. The document body and heuristics indicate a lure to click these links, likely leading to a malicious website or further download. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or redirection 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.co/app/406889139/coin-mster-free-game-hack In PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/roblox-printables-free_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-game-download-free_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-download-play-roblox_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/roblox-free-clothes-codes_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/pg-family-friendly-roblox-content-free-robux-2021-builders-club_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/edit-roblox-game-code-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-hack-robux-2021-pc_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/nuevo-hack-16sept-generador-de-robux-by-piignoiise_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-no-human-verification-iphone_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/today-coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/robux-generator-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-free-5-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-spin-links-coin-master-october-30-2021_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-no-download_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_002_off000032be.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32BE 22652 bytes
SHA-256: 7ab1f559c996d72f58ce740660204e3a6fc243b8b87ff228e2b76a6866334945
font_01_sfnt_off0000651b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x651B 17996 bytes
SHA-256: f7d90c742ed77143965e1bd6f19d83d4aa1a1c074d0feb44f390a9defa22430a

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