Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d92e348c5664dc0…

MALICIOUS

PDF

41.4 KB Created: 2021-05-14 20:34:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4ae63a695410a8ef015fa6582b04e75e SHA-1: efc19ce6ccd816927399de9eb0d8413741190635 SHA-256: 8d92e348c5664dc0dc3c515a0d35c0275e7511816975f03141c17f1d7f5e176b
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a seed-phrase/secret-recovery lure. 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 0.9971

Heuristics 6

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/406889139/hack-my-spins-coin-master-game-hack PDF link annotation
    • http://algierimasonry.com/images/roblox-promo-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/how-many-levels-are-there-in-coin-master_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • http://algierimasonry.com/images/gain-robux_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/lots-of-robux_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/como-descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/new-free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/minecraft-rtx-download-free_GM479516143.pdfIn PDF document text
    • http://algierimasonry.com/images/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-spin-ml-link_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004767.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4767 25184 bytes
SHA-256: 399a7c139926d79e02a2f2f7f2e9743013620fa7d73ca4b42b34362f5cfcc7ed
font_01_sfnt_off00007ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF9 18072 bytes
SHA-256: 64ea7d9e75a5ad0838d86554105b7e844b34b7d170416bdf482dc615b179e3f4

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