Malicious PDF — malware analysis report

Static analysis result for SHA-256 425143032feabd66…

MALICIOUS

PDF

36.7 KB Created: 2020-10-16 18:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8668cd33ecf2616f5ebeb3a6fe714566 SHA-1: 5d5c5f38a438cfa96535423f8059842826050f35 SHA-256: 425143032feabd660e0f4d21cc0fc1621396543d8dd10b725fed344cd907e5ae
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 pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a potential phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent.

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=synthesis+or+direct+combination+reactions+worksheet In PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/kopiwu_gotatumeturi_bovejixegas_vivikow.pdfIn PDF document text
    • https://duxixujojive.weebly.com/uploads/1/3/0/7/130739103/5565559.pdfIn PDF document text
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/4094919.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/sabaraj.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/timufitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5f8714584ce91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f8709fbacd83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_5f8754440f73c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5f89450409c1c.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/0d5dafb7.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/gikunovesizaf_najitimewosop_fexok.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/4144282.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/6069273.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/9fa741a5-bd47-4f00-8db6-85b71d458927/11306631884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d93ae3b-33d4-4c13-a365-ecc5738aa847/sozenewiginiguxesomafini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f0579c-acba-49ea-be49-7b50d12f536c/31892251983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4242b9cd-de22-49f9-9e99-2b9d32734cde/meluvejegoluwiriloz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/964e15cd-b8c0-466c-a9ae-57720e448317/garonawidorobivur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bf59b87-8851-47a1-a5e5-7539a565099a/pumufesofalemurimumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d2a7a9e-f17d-4742-b905-3dd389936aec/88782607620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bee6f75f-a87b-4892-8726-50295a53091d/68753108880.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_off000050eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50EB 5648 bytes
SHA-256: 2b9eec44b910a66442bec9246fb2bd3fcff9db43ecc50b5a4e82144abd2783c3
font_01_sfnt_off000063fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63FD 9900 bytes
SHA-256: 013a2f5bf204100d81aa670b2a7e0b9f507437d42b2db7c63263446f6faa2ab5