Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb31ca8a390aadb…

MALICIOUS

PDF

43.9 KB Created: 2021-05-14 22:13:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 985287810704a688274fb071e62816fa SHA-1: 235ba675fabb926157c899e75ed032197466a3ce SHA-256: cfb31ca8a390aadb0a52b003cab9927f2b9f493be3b37ec8587cddea8e7f1b09
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 0.9969

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-websites-2021-game-hack PDF link annotation
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/how-to-block-someone-on-coin-master_GM406889139.pdfIn PDF document text
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/free-robux-working_GM431946152.pdfIn PDF document text
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/free-old-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/free-spins-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/coin-master-hack-xyz-download_GM406889139.pdfIn PDF document text
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/is-minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/free-robux-meme_GM431946152.pdfIn PDF document text
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/is-roblox-hacked_GM431946152.pdfIn PDF document text
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/how-to-earn-free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d31.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D31 25176 bytes
SHA-256: 7e3010f14acb8f2b9b482483493ebc097816b0632abd23a29f1446060c75bac9
font_01_sfnt_off0000879f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x879F 18836 bytes
SHA-256: ef44fc6ccc8558fc54da3394cf76e38d99de94399ef86c3bb36f5b939f331685

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