Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ef65ff419e8c9d…

MALICIOUS

PDF

45.4 KB Created: 2020-10-22 00:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 61e771588d5449299d368ec6ec8b2c7e SHA-1: 9a28b00af5a6c007e5df641b4445c8e609e79c87 SHA-256: 34ef65ff419e8c9d23014c78ff62cbba01543ff1704eeb2fd41506e5c541fd8d
184 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of an SEO spam or phishing campaign. The document body, though heavily obfuscated, contains a URL that redirects to a malicious domain, suggesting an attempt to lead the user to harmful content. The ML classifier strongly indicated maliciousness, supporting the presence of a malicious redirector and a link farm.

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=hp+laserjet+m28w+manual In PDF document text
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/duruja.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/vaxaki_jemevax.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/3cb113af6.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/wonusorazuxilan-tijikitipiruka.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/daruvitasi.pdfIn PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/vunobemopibunos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374198/normal_5f8b9e1b83af4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5f8886de551ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392651/normal_5f90a18f0734c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5f8a9af56c581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_5f89e5ed4a5de.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/34f0bf9e-7b2a-44ca-97ac-680cbc11a8c2/hp_envy_touchsmart_sleekbook_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7f2102-b73a-46b1-9b26-be822382b878/56162567202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c349dc5f-f089-4ef1-883a-cea038c4ea71/sipitogovanikonokibomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2037e79b-99a1-40ed-86c0-2c760cdd790a/26360432354.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6b6a123-333b-4968-97d5-f01d28f82b54/ribafex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6845/9670/files/cheat_helix_jump_level_mod_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6093/1991/files/gawovepalaselex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94de4ed1-e29f-4049-9d4f-4c86f897643a/78784194558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f256cb4-0cb4-453c-9733-a8ee4c6cf893/vidosuxojasuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d73087f-4873-4ea3-8760-846f8ecee684/17409852960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cce9c9b7-e7b4-4147-a7f2-d87926ed9b29/93220333094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43a69a71-009a-4d47-843c-1be7d5184570/demototidugutajasu.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_off00007236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7236 5420 bytes
SHA-256: d1cf09d3746bd0569af2fcbb1868e02eed3f5ebbd7e866b746429d247801a626
font_01_sfnt_off00008498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8498 10540 bytes
SHA-256: ae148dcbcae891af25c9130f704b7407fcce8144214be5af64a4598d7703085f