Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bccdbc081952b4…

MALICIOUS

PDF

46.9 KB Created: 2021-06-03 14:29:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 28bf8d219f17804c70088a98ef6487d7 SHA-1: 42a689db6a5323ed9e1ac25b385c4ced752c34e8 SHA-256: 91bccdbc081952b483b8727734034bf47c601b2b9baaf3219b94cadfa5d29df1
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 0.9769

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.online/app/431946152/free-robux-no-password-game-hack PDF link annotation
    • https://perpustakaan.stami.ac.id//repository/how-to-get-free-spins-on-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-latest-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-spin-coin-master-apk_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/roblox-hair-for-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-coins-2021-coin-master-link_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/apps-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-coin-master-spin-generator_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/what-tiktok-free-views-without-verification_GM835599320.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/what-is-a-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/easypoints-gg-roblox_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_004_off00004e88.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E88 25260 bytes
SHA-256: 22e9ce674a603a9933294b91a1b5fd65a211ae9d90abe0272e97b09ee190d284
font_01_sfnt_off00008959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8959 2820 bytes
SHA-256: 34dd21cbcbbf8680f9624d5ddfa25e49232e6768200f74ddacb5347fd7a5f6dc
font_02_sfnt_off000092fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92FA 18732 bytes
SHA-256: b254955316d184f98c6f6070526605807868e3146c8b9e5f8ca39f20861b2296

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