Malicious PDF — malware analysis report

Static analysis result for SHA-256 743bd5dcdcb69f74…

MALICIOUS

PDF

44.8 KB Created: 2020-10-14 04:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7ccffaec1e2733329ce27178a2a3445b SHA-1: a431ce01a587a13c045cb49f2a9990e7f72d6c5f SHA-256: 743bd5dcdcb69f7406d2eedd9ceed84a7990387aaf63754b8aac5b5de5ab2bcf
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a reference to the malicious URL, suggesting a lure to trick users into clicking it. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, likely for SEO manipulation or to distribute the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://cctraff.ru/strik?keyword=anatomy+of+abdominal+organs+pdf In PDF document text
    • https://site-1040000.mozfiles.com/files/1040000/41686990835.pdfIn PDF document text
    • https://site-1041068.mozfiles.com/files/1041068/90385390219.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/xopevu_vilugarokobijos_fimorekon.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/ratefunerod.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/6023986.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://uploads.strikinglycdn.com/files/62dfc35e-203f-4837-9b92-50037432bbd4/nenotodogexidixop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9254a1c-f175-4b82-ae6f-5bea16063111/24120691164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ee5ba0f-779d-4e4a-959a-35c5f242c4ec/suposakata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01aacbce-4a28-44d3-b2f7-34a240d1df7f/tijikesatisugunazomexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41b53d97-5efc-4552-9c79-7b11c7762430/kalebukinitewuxowigubigi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0470/6582/5448/files/kozepifobaka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2065/6033/files/29736344635.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_off000065e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65E0 5264 bytes
SHA-256: e6e32cf7e317571939f090f7bae9e6391daebbc865ef07d4f6615654ff9feec1
font_01_sfnt_off000077a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77A1 9540 bytes
SHA-256: 0df8362b8b118485d27d21415378a531c52b9d9cf8aa4b7c2332677cf6769869
font_02_sfnt_off00009832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9832 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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