Malicious PDF — malware analysis report

Static analysis result for SHA-256 693011c0aa03c08c…

MALICIOUS

PDF

36.7 KB Created: 2021-07-04 14:29:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4dc60630851b880301c18557069a9c63 SHA-1: d1bbac220af2882114b9cb808691606ff87f91d0 SHA-256: 693011c0aa03c08c148ec4743b5af67ae355783405fbc47f6362c979bf8ba7ed
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links, many of which point to known malicious redirectors or are designed to lure users with promises of game hacks and free currency. The primary link, http://netcdn.tw/app/406889139/coin-master-free-coins-and-spins-game-hack, is identified as a redirector. The document body and heuristics indicate a social engineering tactic to drive traffic to these potentially harmful sites, likely as part of a phishing or scam campaign.

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/406889139/coin-master-free-coins-and-spins-game-hack In PDF document text
    • http://digilib.stimlog.ac.id/repository/1x1x1x1-roblox-id_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/money-hack-mad-city-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-printables-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/robux-and-tix-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-roblox-for-robux-script_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/robux-mania-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-en-francais_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-credit-card-hack-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free4now-info-get-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
stream_002_off000037bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37BB 23396 bytes
SHA-256: 42c7e36197a8969dae214d9d8e14ebbaaee9ab384d3f8de1f53893624c46e977
font_01_sfnt_off00006c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C90 18348 bytes
SHA-256: 8f4e14d352258b2a04c4750a5c5e6ee18e44525ef82eed3820f54d352c64eef8

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