Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8eedc226b667818…

MALICIOUS

PDF

37.7 KB Created: 2021-07-05 20:13:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bf26eac1752ba4e340abc9d9c5329f87 SHA-1: d9da7ec99844dc6fbf4e758058384ba5e0918b69 SHA-256: b8eedc226b6678187efe29f31003077d7370ddfde067f239e69b2d19ce6ebe95
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-links-for-coin-master-game-hack PDF link annotation
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-clothes-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/someone-hacked-my-account-roblox-how-to-get-robux-back_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-robux-hack-free-no-download_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-robux-online-hack-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/hack-roblox-accounts-download-file_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-hack-quick-and-easy_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-roblox-shiny-charm-for-pokemon-brick-bronze_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/ich-bin-am-hacken-roblox-name_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/studio-free-10-000-robux-lim_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/lynx-hack-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-hack-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-jump-hack-in-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/daily-coin-master-link_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/stinkywinkys-robux-hack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-hack-spins-apk_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000329b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x329B 23096 bytes
SHA-256: 94404126646338f9e6bab8d9e40e54dec5c049356c6ee164ac6f112adea8beb5
font_01_sfnt_off000066f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66F8 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off000070dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70DD 18168 bytes
SHA-256: 4fd4acee7e61db1e46350db43a8aa18a4e40f59134fdf79b97aaab2dfd194894

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