Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfea1764232812c…

MALICIOUS

PDF

49.8 KB Created: 2020-10-30 15:13:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a782794f8e9e3e6a1eccead5f24c46e7 SHA-1: b24c9d73ca899434ef1da9bbf74385bc4ac5764b SHA-256: 9cfea1764232812cd5472c036d817fdcd0c2d52fe5c8073a64c3cd28643c08aa
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to malicious infrastructure. The ML classifier strongly indicated maliciousness. The document body, though partially obfuscated, contains the malicious URL and references to other benign-looking PDF links, suggesting a lure to a malicious site.

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://ttraff.cc/pify?keyword=avis+we+try+harder+logo In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/animal_kingdom_park_map_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/the_english_renaissance_timeline.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/maths_practice_book_for_class_5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/5254/5212/files/rasonezidamagez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5817/5895/files/durood_e_muqaddas_in_arabic.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/chordata_and_non_chordata.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/18909045803.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/8130/7560/files/gamatex.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/bohr_postulates.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/6695/8239/files/46103766300.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7250/2942/files/sujibapigetexonosasitaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3338/5882/files/36051293443.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/4519/6454/files/fiwewagufagadufudufena.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/1561/7691/files/practical_content_strategy__marketing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/6326/9280/files/advanced_mathematics_1_textbook.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_off00008108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8108 5332 bytes
SHA-256: 653e1a09ae5e9f351ae62aa65eb492c34c761783d5708af8a05836288214e289
font_01_sfnt_off0000933c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x933C 11956 bytes
SHA-256: 23fa91b04f5feb6f43ed55a9185fb7505df3787c327ad45997a42c7c9fa2991a

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