Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ff1de319573541…

MALICIOUS

PDF

44.3 KB Created: 2020-11-05 00:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0e0789035889923783d5e64dd72544ce SHA-1: 22b0e8011407acc71951ac1a70ecc5d8395ed276 SHA-256: 43ff1de319573541d7fd1fa94c7e1b78205345c4deb2bc2a5c72fb658a04cd04
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirectors and link farms, suggesting an attempt to drive traffic to malicious sites. The document body and embedded links are designed to appear as search results for games, a common lure. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection, likely leveraging PDF's ability to embed JavaScript for further obfuscation or exploitation.

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=fnaf+sister+location+unblocked+games+66 In PDF document text
    • https://bufibefoxoxopij.weebly.com/uploads/1/3/4/4/134489975/tutegeluzof-dejejufuwidaxar-kosutexaz.pdfIn PDF document text
    • https://kenumobubedu.weebly.com/uploads/1/3/4/3/134370592/1662882.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/ef4ef.pdfIn PDF document text
    • https://panemomozig.weebly.com/uploads/1/3/4/5/134503052/tatufirajusep_sivoxi.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/fimevuzofolufur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/bootstrap_file_upload.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/download_antivirus_apk_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/introduction_to_geological_mapping.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/biology_question_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/project_report_on_greenhouse_effect.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/65556562707.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/manual_apple_ipod_shuffle_2gb_4th_generation.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_off00006e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E69 5656 bytes
SHA-256: 79e3211291d3a9a3355a63adc8bcb5ca80c9ae157d7ae969a56f7ab19f7df0ee
font_01_sfnt_off0000819a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x819A 10148 bytes
SHA-256: 2fb2f0436a8b0a03112e9eb6b5fd21210a498fee69092799101d49533394d9b9

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