Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b118c612bb75c33…

MALICIOUS

PDF

47.0 KB Created: 2020-10-14 22:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ce1b1fb49dac68b2cabfc8795d9c1993 SHA-1: 1121c6befe9d7f5df719ddac80ad728f557894f5 SHA-256: 4b118c612bb75c33b9c2ded8219e48b66c0b947b09effcfdde724e4d6a935aac
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 at 'https://ggtraff.ru/123?keyword=puntos+de+crochet+paso+a+paso+pdf', indicating a potential distribution or redirection mechanism for malicious content. The ML classifier strongly flagged this PDF as malicious.

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://ggtraff.ru/123?keyword=puntos+de+crochet+paso+a+paso+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f87381b3d63f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f8707ee5fa91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5f871036b69e1.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/selagu-wugixinoxule.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/xakegagifilixig.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/jogowezokuvaxu.pdfIn PDF document text
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/vodumalupelakeg-balefavanixomaf-laxumoxetitab.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/1696278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5f871d3243493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366304/normal_5f872aa16ecbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5f873d8b4ab7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5f8730bee1123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f8718c3bf62b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4927/1975/files/michael_ealy_wife_net_worth.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/1485/6093/files/tujog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/294d82d6-691c-4df7-be3c-6761be0afb1f/puwur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d99c8e6c-21c5-4cc5-9f32-ae634e7afb6d/4324839176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7527b78a-5a5a-4b12-a287-cae1cc6e2653/livesimujitikemapefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea28938d-9df2-40bf-b393-bd401ad57981/31306406112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c47bfd52-1264-4861-bab9-d9cd775172e4/medetevekin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0238/2494/files/fopuzefufanowo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5725/6869/files/romero_in_english_from_spanish.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_off00006c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2A 5048 bytes
SHA-256: 95d30fdd096109c70c46e2e11d8fc00e03688fd530f706c86aadc89de5e4b048
font_01_sfnt_off00007d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3A 10272 bytes
SHA-256: 66f78b221d1ca9b38bbb8dac84b5c86739c809facbc112b5c3b0186cc6b91a1c
font_02_sfnt_off00009ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9ECF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3