Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba16e524bec1dfc…

MALICIOUS

PDF

42.6 KB Created: 2020-10-03 20:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4d09f8e9c630cd410c1f34c4ea1b4494 SHA-1: 6bfff217f620a47b95e029e146aa2a1ae90c0dac SHA-256: 4ba16e524bec1dfcb9319092f73ae7b24548178a4a9f79eeb34c1319a13a3459
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, suggesting an attempt to lead the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains the target URL and appears to be a lure related to a product manual. The ML classifier strongly indicated maliciousness, and the PDF structure itself was flagged for linking to redirector infrastructure.

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://ggtraff.ru/strik?keyword=lowrance+elite+7+hdi+manuale+italiano In PDF document text
    • http://files.kristenwambach.com/uploads/1/3/1/8/131855992/7d37a1396.pdfIn PDF document text
    • http://files.adelaidehulahoopers.com.au/uploads/1/3/0/9/130969546/944760.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/9170a603-49d2-4029-beb9-bab4919f3e0a/15260421062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/928fa85a-7198-4a49-85a7-0f96fdefe009/muzumapugewenomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d28b852e-f16e-492c-b9f9-11b1b27c6c87/44231419262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b0395d-2eb8-414a-a7d2-e6639b67d239/10196277370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15315661-ad7a-453f-acc7-5f67fe49e7a6/32066804550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d41006b-0a0b-4631-8902-449eace637ae/mafurirawefolewinaguded.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865ba1d1-8a2d-44d9-89d5-d90c5e1e4326/jalatomakoxabewozimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57314ed2-67df-49bb-b022-f40c326b2ffe/70742357771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca28c6e-f7db-4c92-804b-a4608fd899ef/zapepajam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adce25e3-3a2a-4119-b066-3087937b7068/55749201670.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_off000064e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64E7 5112 bytes
SHA-256: 0e502efe73f3cdea67c3d8f41f3637551e29f9b791027808e9fcfd836973b236
font_01_sfnt_off00007639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7639 12096 bytes
SHA-256: 46bc83fafc088762fdc9779d31d5c6ce642081543d99184a6ff449df338698ad

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