Malicious PDF — malware analysis report

Static analysis result for SHA-256 728f789651cb8851…

MALICIOUS

PDF

53.8 KB Created: 2020-10-05 07:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b97fd596f365cffd86f11f8cf5d1c0a0 SHA-1: ebcc2b1d9e7cc0d2a48f2166fe03388d1f1283db SHA-256: 728f789651cb8851723fd3b2d60a21cda34b01ff0f7657c22e45ced2350f2b51
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ggtraff.ru/pify?keyword=windows+server+2012+r2+unleashed+pdf+download In PDF document text
    • https://site-1037212.mozfiles.com/files/1037212/rakige.pdfIn PDF document text
    • https://site-1042009.mozfiles.com/files/1042009/93265240597.pdfIn PDF document text
    • https://site-1043438.mozfiles.com/files/1043438/retomovazixexevazemug.pdfIn PDF document text
    • http://files.havenwoodteaco.com/uploads/1/3/1/6/131637291/jitajedef_fipogu.pdfIn PDF document text
    • http://files.redwaterminorball.com/uploads/1/3/0/7/130738969/dovojafuze_varat_felozes.pdfIn PDF document text
    • http://files.sunflowerchamberorchestra.org/uploads/1/3/1/6/131606020/zopevutowofilar.pdfIn PDF document text
    • http://gagigema.maninthemoonpub.com/uploads/1/3/1/1/131164243/258cfed48.pdfIn PDF document text
    • http://mobep.nikkimorrison.com.au/uploads/1/3/0/7/130740249/sovupoloze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8676/4446/files/1721704988.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2722/4986/files/new_order_the_perfect_kiss_bass_tab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8531/5744/files/40899037895.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4020/2142/files/10316968773.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0044/6626/files/gurelilezofokanokuwisene.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/0370/8053/files/wheatgrass_manual_juicer_machine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6278/8245/files/fedejeta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1852/1242/files/wa-2608_tv_antenna_installation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4793/8979/files/les_jeux_sont_faits_translation.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF5 5420 bytes
SHA-256: 965c86d85ccf5032dbbb7708d491dbbb25bbdc7a06202b725d36ade559b98e5e
font_01_sfnt_off00008272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8272 10528 bytes
SHA-256: fdb850615a585181936a04487cd8a6b9e7fbaa51f137376fce9175d9f347d071
font_02_sfnt_off0000a6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6BC 16100 bytes
SHA-256: f12bcc42cb143e9cc41a08ef9f9c81c8a36c017982c073a20263204097028d61
font_03_sfnt_off0000bb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333