Malicious PDF — malware analysis report

Static analysis result for SHA-256 f525a7ee046fbd4f…

MALICIOUS

PDF

53.3 KB Created: 2020-10-28 19:22:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ce1b9697540f6499925a0d111c73a2da SHA-1: ef1902fc63eacb893aa728c0aec562b439c42104 SHA-256: f525a7ee046fbd4f6a898a1ab21fef6f54d0cfaa402cd1a93f4c794c01ab6653
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector. This redirector points to a URL that appears to be part of an SEO link farm designed to phish users. The ML classifier strongly indicated maliciousness, and the document body, though heavily obfuscated, contains the malicious URL. The presence of embedded URLs and the link farm structure suggest an attempt to drive users to malicious infrastructure.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=nicole+nail+polish+miss+independent In PDF document text
    • https://lejigatoni.weebly.com/uploads/1/3/1/8/131871980/ae1c548ebd.pdfIn PDF document text
    • https://bitekiparoduj.weebly.com/uploads/1/3/4/0/134017536/bewanigev_pexirew_xelidolimuzipu_vupek.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/807c7a30-fe11-4abc-b53e-8b39b7fb8403/40907324747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e97f9d1-320a-410e-b7ad-cbbca92f2f4c/31764932522.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/dagipiworomefokexadutese.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/atharva_veda_in_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/8462/0217/files/operaciones_con_funciones_ejercicios_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e60e524a-71ac-4bf5-94cf-bdbdbde21bce/80330024387.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2306/4488/files/classic_wow_hunter_guide_leveling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99d16491-d47f-487b-9bc0-1aabae7146c6/kafej.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/vavifojodixonininedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e595fc7e-66e6-45b6-aa6c-c3fce4523b15/sejasamaxakumuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b51581f-2ea5-4417-ab91-bf80ae00d16d/18850014291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b928ce-4383-4d0d-bc1f-a3514206415b/how_to_make_meth_pipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb1a5020-5297-4c75-a0af-558360d35dc0/acid_and_alcohol_reaction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6eb52de-079d-4ed9-8812-fef082be7b66/inside_job_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c328e449-ca56-468d-8a12-d3228a75d88e/do_you_not_tip_on_postmates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98b4c674-de98-4710-bd05-b179df33c31f/muxafadiforap.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_off00009168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9168 5188 bytes
SHA-256: d485f4705b0742aa14f9e2723975b24b764dfc5265b8a9cd0b467c803e2dec03
font_01_sfnt_off0000a2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2EB 10868 bytes
SHA-256: 300fd30308d03777d5f9fc96619e25181cf6e8d6111146349e6092e54f48feb0