Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f93fb95cb7b53d…

MALICIOUS

PDF

42.7 KB Created: 2020-07-08 18:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb9e9cee574540e5933b1e9bb1e18103 SHA-1: e5834e2326769be274338658f30032916e8ac747 SHA-256: 56f93fb95cb7b53db9d6f28c3b96f4df16c1ed021fc53a242f44b0eed3a2eaf4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external resources that appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, while containing garbled text, also includes URLs, reinforcing the malicious link redirection pattern.

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.ru/wb?keyword=cubixx%20100%20l%20manual
    • http://files.royalpawsmobilegrooming.com/uploads/1/3/1/8/131856844/490a3.pdf
    • http://files.allenhurstapts.com/uploads/1/3/1/4/131482892/646d2043856.pdf
    • http://files.annagalatirealtor.com/uploads/1/3/0/7/130776718/979473.pdf
    • http://files.jjrrlab.com/uploads/1/3/0/8/130873907/75d05.pdf
    • http://files.svfmcoalition.org/uploads/1/3/1/3/131380953/8205002.pdf
    • http://files.saujs.co.za/uploads/1/3/2/6/132681824/8694376.pdf
    • http://files.jumpislandmi.com/uploads/1/3/1/6/131606670/3588102.pdf
    • http://files.beccamccreedydesigns.com/uploads/1/3/0/8/130873907/9422286.pdf
    • http://files.biggsbassethounds.com/uploads/1/3/1/8/131857071/84fb7a2093dbc.pdf
    • https://mijapafuvuve.files.wordpress.com/2020/07/78766218208.pdf
    • https://ladisipe.files.wordpress.com/2020/06/luzudizesesedozifon.pdf
    • https://varotedip.files.wordpress.com/2020/06/zajikaxid.pdf
    • https://rixukilivex.files.wordpress.com/2020/07/mepalitesebejunumak.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26443777516.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65069223210.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jewaxepolirabosumasedud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gidawibozifuniji.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054ed.bin
c3a29aa778f3df668352c40bf0d057fe8d921582e1e0a2d41fbc80759e445a3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54ED 4556 bytes
font_01_sfnt_off0000643c.bin
b3b13dec645a9a6c957b0f20543bda5573b28d688e7f3b97883dfc7ccae89cf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x643C 8036 bytes
font_02_sfnt_off00007a23.bin
dc5301252863c6ef5285a0105f6ce0ee15dbac8ac24971226809c9cd9e5646d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A23 10968 bytes

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