Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed18440cdef93f7…

MALICIOUS

PDF

46.5 KB Created: 2021-05-19 09:32:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9209ca5116eb42d9d664420f18fba793 SHA-1: ca774b25c16d2ffdb386f9302eeaf69486aba281 SHA-256: 1ed18440cdef93f706df5743e759b8429793c2e75cf7cb11e3623f6f55f24b40
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on domains associated with SEO link farms and game hack lures. The primary lure appears to be 'free Robux' or 'Coin Master' hacks, directing users to potentially malicious download sites or phishing pages. The document's structure and content strongly suggest it's part of a campaign to drive traffic to these sites, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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 https://netcdn.xyz/app/431946152/roblox-pink-free-robux-game-hack PDF link annotation
    • https://vodomery.kiev.ua:443/images/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/download-coin-master-apk-hacked_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/free-robux-link_GM431946152.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/robux-xyz_GM431946152.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/coin-master-free-2021_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/new-free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/bux-free-robux_GM431946152.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/coin-master-spin-link_GM406889139.pdfIn PDF document text
    • https://vodomery.kiev.ua:443/images/coin-master-free-spins-link-today-instagram_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_003_off00004adf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ADF 25596 bytes
SHA-256: 735026ab0369ceadf9d38c8719e3b711f8906f4d3a5692078bdb6878560d2a49
font_01_sfnt_off0000861f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x861F 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off000092c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92C6 18532 bytes
SHA-256: 62e9169d40109a3abf4bdf842601a34c83c90693a7fee2a3f682a11a81f7ba3a

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