Malicious PDF — malware analysis report

Static analysis result for SHA-256 855ae52bd8545cef…

MALICIOUS

PDF

50.5 KB Created: 2021-06-03 13:04:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 631c803de1a71d416cf585368f8372fb SHA-1: 9f3b16d1593b753fbc1173b4c8be1032111d9967 SHA-256: 855ae52bd8545cef8ff21d5defce05070f6d16c62ade2aeeb0939d9601057093
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 0.9779

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-kid-friendly-game-hack PDF link annotation
    • http://pustaka-smpn3tpi.com//repository/how-to-get-free-outfits-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-minecraft-skins-pe_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/hack-coin-master-android-2021_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-gifts-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-hack-without-verification-code-2021_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-attacks-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-hack-without-verification-code_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_004_off000051ed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51ED 29368 bytes
SHA-256: d595f1b66281337d0529389d46139c9203653cfece4e78ff366f52b5488d5322
font_01_sfnt_off0000952c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x952C 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000a23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA23E 18560 bytes
SHA-256: 454f7722b5e362ebb3dfaacf6303323d9fe80b0a3b091af17d82283aff73172d

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