Malicious PDF — malware analysis report

Static analysis result for SHA-256 f035bdd5af62010e…

MALICIOUS

PDF

49.5 KB Created: 2020-10-28 11:49:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 43662ccad035db5724128f9f0b1e5045 SHA-1: 2d7dc683a12f97625befd873feb91c102b4d87c1 SHA-256: f035bdd5af62010e8b58cb066aae593d82f1ceacd28dba219a2fb0f2acc1e2b4
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, indicating a link farm. One of the primary links redirects to a known malicious URL, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

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.me/123?keyword=rio+linda+high+school In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_5f96576bc712f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5f90990262d24.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/4056517.pdfIn PDF document text
    • https://gojemafofapuvog.weebly.com/uploads/1/3/2/6/132681271/fesaregekob.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/9850514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383695/normal_5f8f595b9a6b7.pdfIn PDF document text
    • https://jasazifo.weebly.com/uploads/1/3/1/4/131437377/piruzet-fafimevowelawew-fasakonilopov.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/8172d55b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_5f8c062540f0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368266/normal_5f8a6785eb769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_5f8a2ab804d33.pdfIn PDF document text
    • https://zifidobu.weebly.com/uploads/1/3/4/3/134371145/vusix_vaxanuwo.pdfIn PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/30661f2f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_5f9892de7af0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381748/normal_5f8fe4c3cdfaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_5f98497715fad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387240/normal_5f98e83d528e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372972/normal_5f88b452c98f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_5f8a016c3a352.pdfIn PDF document text
    • https://bujezabuzi.weebly.com/uploads/1/3/4/3/134310034/3539128.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/1/0483/5849/0275/files/52503460816.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2087/6962/files/universal_sports_app_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1688/6678/files/download_helix_jump_apkpure_mod_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5295/7335/files/another_word_for_team_oriented.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_off00007f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0C 5112 bytes
SHA-256: d55a59e370d0f3f87292cf78001254cca20bcada2753d1f7765c0e68e0e59cff
font_01_sfnt_off00009070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9070 12412 bytes
SHA-256: d2e4f496a11d7711ce5ea01c6fd86ceaa4f8f89f9100536b73abbc35633a7b74