Malicious PDF — malware analysis report

Static analysis result for SHA-256 360bd717228b7e8f…

MALICIOUS

PDF

44.3 KB Created: 2020-10-15 19:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c46d778cc6104bce273f2c59113d25c2 SHA-1: 6d2933781e400ba49a028eb5b57c8024667ceb06 SHA-256: 360bd717228b7e8f6748a1f24b0cc43ce184bfd4bcf4e3784aeaeb9ab10f99a0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many pointing to disposable hosting services, and one directly to a known malicious redirector. The document body, though heavily obfuscated, contains text related to voter ID instructions and URLs, suggesting a lure to phishing or SEO spam sites. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL confirms the intent to lead users to harmful content.

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://cctraff.ru/123?keyword=form+6+voter+id+instructions In PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/a9069b58110bb6.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/8e42bfb8d1b0f.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/fafufatasavo.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/7240363.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_5f8865174dd7c.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/b99b8d7f0cc01.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/movew.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/xugiwupiga_gonow_wuwazavatamuvud_mowiwa.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/56c4742ffb2635.pdfIn PDF document text
    • https://xedaliwim.weebly.com/uploads/1/3/1/4/131454603/temopuvaguvujuzes.pdfIn PDF document text
    • https://site-1037848.mozfiles.com/files/1037848/24240106630.pdfIn PDF document text
    • https://site-1038590.mozfiles.com/files/1038590/15783095794.pdfIn PDF document text
    • https://site-1036832.mozfiles.com/files/1036832/sutakapemew.pdfIn PDF document text
    • https://site-1038583.mozfiles.com/files/1038583/45606915691.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f87465ecb485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5f8819076238f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_5f873222e6869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368969/normal_5f87a78a65261.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8316c5d2-d2da-47d1-bf5d-8c6a52b2b2fb/71089854868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d792287a-0166-4f3e-bfc6-31870216b083/78485696003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/435e3e93-a49d-48fc-bea8-d28175ec463e/13988018717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67448f5d-2ef1-4420-9b12-57f142ea262c/7200664705.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F00 5012 bytes
SHA-256: 320f9f85bcbe585af3433dfa4c89ff5cafea3d1a880474b5ef647dd18341f814
font_01_sfnt_off00007fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFF 10488 bytes
SHA-256: f8aeb42ddbce00cb0517948a41ee9568a4310a354c0fc2005a05bfe7073fa9e4