Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e2eabeb43c31d2…

MALICIOUS

PDF

55.2 KB Created: 2020-10-13 17:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f356304382156de83daacb19805b378f SHA-1: 3907aaa4c67e0b8e663a0ec35f407ca57b375af2 SHA-256: d7e2eabeb43c31d2e1047f9b738239df3b7f47439f8924105a39bb3b5f302f62
184 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links pointing to various external websites, many of which are hosted on disposable domains. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection, suggesting an attempt to lead users to malicious content or phishing 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://ggtraff.ru/strik?keyword=badland+winch+installation+instructions In PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/rebodi.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/613a711ec7ef.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/batagebexi.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/297c0.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/xewuj.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3731638.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/7d3707d5d.pdfIn PDF document text
    • https://site-1036632.mozfiles.com/files/1036632/24302565620.pdfIn PDF document text
    • https://site-1040766.mozfiles.com/files/1040766/wagevudotazanegogazufoxo.pdfIn PDF document text
    • https://site-1038427.mozfiles.com/files/1038427/xeparemodeninobavu.pdfIn PDF document text
    • https://site-1038789.mozfiles.com/files/1038789/tiwulekubirima.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/1/0486/0913/2704/files/hp_probook_6570b_battery.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9872/5275/files/metaphase_1_of_meiosis_under_microscope.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/3349/3409/files/83175378930.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/2465/8844/files/fimepawufiwogemo.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_off00009bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BF4 5168 bytes
SHA-256: aed1ff2988338fa75f01814f91f9710fc1969ad182bb07f3620e200403cf5ec5
font_01_sfnt_off0000ad89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD89 10028 bytes
SHA-256: 8f5173ecb30870a420a6d0c2116623f04ad4c0ac28bf0222f0b46378f7e8ede4

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