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) First seen: 2020-09-24
MD5: fb9e9cee574540e5933b1e9bb1e18103 SHA-1: e5834e2326769be274338658f30032916e8ac747 SHA-256: 56f93fb95cb7b53db9d6f28c3b96f4df16c1ed021fc53a242f44b0eed3a2eaf4
184 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 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 In PDF document text
    • http://files.royalpawsmobilegrooming.com/uploads/1/3/1/8/131856844/490a3.pdfIn PDF document text
    • http://files.allenhurstapts.com/uploads/1/3/1/4/131482892/646d2043856.pdfIn PDF document text
    • http://files.annagalatirealtor.com/uploads/1/3/0/7/130776718/979473.pdfIn PDF document text
    • http://files.jjrrlab.com/uploads/1/3/0/8/130873907/75d05.pdfIn PDF document text
    • http://files.svfmcoalition.org/uploads/1/3/1/3/131380953/8205002.pdfIn PDF document text
    • http://files.saujs.co.za/uploads/1/3/2/6/132681824/8694376.pdfIn PDF document text
    • http://files.jumpislandmi.com/uploads/1/3/1/6/131606670/3588102.pdfIn PDF document text
    • http://files.beccamccreedydesigns.com/uploads/1/3/0/8/130873907/9422286.pdfIn PDF document text
    • http://files.biggsbassethounds.com/uploads/1/3/1/8/131857071/84fb7a2093dbc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://mijapafuvuve.files.wordpress.com/2020/07/78766218208.pdfIn PDF document text
    • https://ladisipe.files.wordpress.com/2020/06/luzudizesesedozifon.pdfIn PDF document text
    • https://varotedip.files.wordpress.com/2020/06/zajikaxid.pdfIn PDF document text
    • https://rixukilivex.files.wordpress.com/2020/07/mepalitesebejunumak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26443777516.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65069223210.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jewaxepolirabosumasedud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gidawibozifuniji.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54ED 4556 bytes
SHA-256: c3a29aa778f3df668352c40bf0d057fe8d921582e1e0a2d41fbc80759e445a3f
font_01_sfnt_off0000643c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x643C 8036 bytes
SHA-256: b3b13dec645a9a6c957b0f20543bda5573b28d688e7f3b97883dfc7ccae89cf7
font_02_sfnt_off00007a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A23 10968 bytes
SHA-256: dc5301252863c6ef5285a0105f6ce0ee15dbac8ac24971226809c9cd9e5646d9