Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5631d52a106c896…

MALICIOUS

PDF

46.6 KB Created: 2021-05-15 01:00:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cacc8423562dfa2b29d5ecd5014243be SHA-1: 22d3d424393e8306d30533fe2d8749c8bed200c7 SHA-256: a5631d52a106c89645bfce791228c7300549a1b195e2625cf0d3f7b5b7fb947f
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 0.8948

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/free-robux-com-roblox-game-hack PDF link annotation
    • https://kojak-group.com/userfiles/files/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-script_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/hack-coin-master-spin-apk_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-hack-spins-game-download_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-coins-today_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/roblox-free-robux-website_GM431946152.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_off00004a43.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A43 25920 bytes
SHA-256: 539ccf4670cfd9c74f91f70266e93654cd3412c3772cf1e4e980b64199a1410a
font_01_sfnt_off0000869f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x869F 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000093b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93B1 18348 bytes
SHA-256: 0a91f6cfdfc59c313b80ddaaf1db47d93b267e297f9a4be9f2abca10b90eba79

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