Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5617e52d1ca269…

MALICIOUS

PDF

47.3 KB Created: 2021-06-04 00:11:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b11a7b6436ae0e568b34c3f46cecd9ba SHA-1: c37d34775ad5b33e28e22b92575d2905700da672 SHA-256: 1e5617e52d1ca26971999d24b7fed9e5ccc8533298fbe1ed2a47e3996280085e
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/406889139/how-to-o-get-free-coin-master-spins-game-hack PDF link annotation
    • https://lib.unitri.ac.id/repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-spin-hack-pc_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-download_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/roblox-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-codes-no-verification_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_off00004f8c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F8C 26244 bytes
SHA-256: bc2e61e0d720099aea89abed15994c9c8f3ee42d9db5b2589d89b8c7eb3b9c96
font_01_sfnt_off00008bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BAC 3204 bytes
SHA-256: b7fe42cb1da39e96c756399b3532633df029c1fbb3443b9e17d98df25c90dc65
font_02_sfnt_off000096b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96B0 18052 bytes
SHA-256: 1a49309645179e5aa03d30e235780e1615dc0ec238564b82d4d907f08b29e71b

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