Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d6329b032f357e1…

MALICIOUS

PDF

62.8 KB Created: 2020-07-18 21:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abf62dbeab2a0ab11d4e4ae1e6627aeb SHA-1: 861bd70e468a33c818f59838e845db92b3c1c4a8 SHA-256: 0d6329b032f357e1541f62068513da7b74bf9b1eddbb13a48fd68b2facadb4e5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting the document's primary purpose is to generate traffic through SEO spam. While no scripts were extracted, the presence of malicious redirectors and the link farm pattern strongly indicate a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ttraff.com/wb?keyword=translation%20mechanism%20in%20prokaryotes%20and%20eukaryotes%20pdf
    • http://files.aprillitwinbooks.com/uploads/1/3/1/4/131453867/3195580.pdf
    • http://files.two-bridges-flyball.com/uploads/1/3/2/6/132681665/beac4054d.pdf
    • http://files.readywritercsb.com/uploads/1/3/0/8/130874526/3019184.pdf
    • http://files.modelproduce.com/uploads/1/3/0/7/130775658/jukedeloxip.pdf
    • http://files.valmalencoalpina.com/uploads/1/3/0/9/130969435/witebi_gasikinunub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://jivimum.files.wordpress.com/2020/07/16439333909.pdf
    • https://kefixopow.files.wordpress.com/2020/07/10617296684.pdf
    • https://sakadilarule.files.wordpress.com/2020/07/bilujava.pdf
    • https://novebagi.files.wordpress.com/2020/06/lajomet.pdf
    • https://fapezajudu.files.wordpress.com/2020/07/93851915401.pdf
    • https://divezifek.files.wordpress.com/2020/06/zenosedojisu.pdf
    • https://ziradodenu.files.wordpress.com/2020/06/pobowenujopesudukudid.pdf
    • https://megazotawulo183772260.files.wordpress.com/2020/07/87404492558.pdf
    • https://kataxufekor.files.wordpress.com/2020/06/65136009818.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3464/files/bakejegezibidir.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nagexonulelaxefirulilona.pdf
    • https://cdn.shopify.com/s/files/1/0433/7690/2309/files/sewazaketakonabumaxona.pdf
    • https://cdn.shopify.com/s/files/1/0428/9301/7247/files/xediz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zemivok.pdf
    • https://cdn.shopify.com/s/files/1/0432/6309/9040/files/givokusimuxujuvowuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23313492251.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3dc.bin
97aeec86f3b8907050e1884638c3d01020ee621af41423b12c9c9e8649a29c3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DC 5392 bytes
font_01_sfnt_off0000c601.bin
2a289365dcbaa8bcd716c38c29ff6d3ec961600a3c9d0480e77b6aeeeaf4eda7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC601 12440 bytes

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