Malicious PDF — malware analysis report

Static analysis result for SHA-256 d428f1c0972912d5…

MALICIOUS

PDF

43.0 KB Created: 2021-05-11 08:12:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 30ec42b068bb821add98c1787a14f1ac SHA-1: d623be3e302f87e53c0c9d158da945d5037a2dbf SHA-256: d428f1c0972912d572a5f69dc04d9df5583496525977c3d631c9052216667755
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 0.9962

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-scams-game-hack PDF link annotation
    • http://algierimasonry.com/images/how-to-get-free-coins-in-coin-master-game_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/how-to-get-free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/lots-of-robux_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-tricks-and-hacks_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/cool-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-free-coins-cheat_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • http://algierimasonry.com/images/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-free-coins-today_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/gain-robux_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_off000045e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45E4 26416 bytes
SHA-256: 5f1b0d43c8d9c0879c1c99ced7b8d8a5e60b5f7fed6e561ab6f02571c8084466
font_01_sfnt_off000082db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82DB 19260 bytes
SHA-256: 41db5582935430f2796150e83baaf3bcd5c42dfb7ab2ddab8740aaa1b9f66ae5

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