Malicious PDF — malware analysis report

Static analysis result for SHA-256 9064cbca3b7eb249…

MALICIOUS

PDF

56.3 KB Created: 2020-10-18 05:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 031413c1e82ad826a3068d66950ad197 SHA-1: 674d5c85d0dd2f6314ada9a5bc3b80dbe3942913 SHA-256: 9064cbca3b7eb249240256f1f55aa1d0341777ce6f72470c0866e77c1266bce2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable hosting services and a known malicious redirector. The document body, though heavily obfuscated, contains URLs that are likely intended to lead users to malicious content or phishing sites. The ML classifier strongly indicated maliciousness, and the link farm behavior is a common tactic for SEO poisoning and redirecting users to malware or scam pages.

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.link/123?keyword=programming+abstractions+in+java+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5f89cb7f88ee7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f87168b12df2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5f872b2a9122b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_5f89e6b42124b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_5f8b82e55f086.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/126930.pdfIn PDF document text
    • https://pepuzategazeg.weebly.com/uploads/1/3/1/4/131453576/2489123.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/jekowis_fuvonobux.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/zanazanekoxel.pdfIn PDF document text
    • https://kutenamig.weebly.com/uploads/1/3/0/7/130740069/zoxavelekijokekuz.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/baxabusojuv.pdfIn PDF document text
    • https://waniremupamed.weebly.com/uploads/1/3/1/4/131407535/sazusudawikakeriz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1326/6344/files/91052158136.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8229/2629/files/bovegakara.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/4963/0113/files/42346909702.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1433/5897/files/83155887235.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0475/4259/9846/files/sop_apgar_score.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2949/8522/files/scale_map_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5103/6055/files/rise_of_nations_download_google_drive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5059/7528/files/fegegavan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/0634/0515/files/layer_architecture_advantages.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66AB 14212 bytes
SHA-256: bd279e3e7b857380e16008e3ff2550976cad2efb817e2cd83c83cc35b3ed2597
font_01_sfnt_off00009484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9484 5720 bytes
SHA-256: a0e877839f997210f90be44b06c0de0ff8fcd56317acbaac3e378038b4f440ff
font_02_sfnt_off0000a7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7E6 13864 bytes
SHA-256: 952e3b9db77fe495ca81e4d696ceb2a865fd3fc3764cc00c9c28b6a6e09f7f80