Malicious PDF — malware analysis report

Static analysis result for SHA-256 7678aeb3a3890ca8…

MALICIOUS

PDF

43.7 KB Created: 2020-11-01 19:38:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2a0d881a4dd80c5cd0b783ae0a7cfbef SHA-1: 9d6ca87b679e880ace36295787ef9a0b761c6db5 SHA-256: 7678aeb3a3890ca83ecb849bb4ebdd32f1b244fe01b18a13f597c7c9a50ce109
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/123?keyword=what+animals+lives+in+the+forest+floor. The document body, though heavily obfuscated, contains this same URL, indicating its likely purpose is to redirect users to malicious sites. No scripts were extracted from this sample.

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/123?keyword=what+animals+lives+in+the+forest+floor In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_5f9bcf69518b7.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rugatu-rugot.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/gusopoxuxokazew.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://cdn.shopify.com/s/files/1/0501/7275/6129/files/dragon_ball_z_mini_warriors.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/8298/6675/files/most_reactive_elements_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81ac4db-0b9d-4222-a3ea-34faea5a913b/sumudologuboxetokuno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4302/7109/files/zagekiwuxasegaduzix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3314/0127/files/how_many_cloth_diapers_do_i_need_for_a_1_year_old.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5365a72-5b61-49fa-914a-dd983fbf4b76/75464587622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c81e44-d904-4848-800b-72cdbd282782/72001344753.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5699/6245/files/romifamobibuvekukawalap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d8cbc34-0a8e-45f1-8a81-c63e974db9bb/dekexiwiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4763/3575/files/zombie_tsunami_mod_apk_uang_tak_terbatas.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_off00005ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF7 4868 bytes
SHA-256: ea211c86b7072ace1187c648b5f3565528caff33fd5bd67be4a1110babe69847
font_01_sfnt_off00007059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7059 10396 bytes
SHA-256: 00a91be58c33a8cd3aa0df4d38c185e230f20307f29dcfd49a8446b2f206c633
font_02_sfnt_off0000940e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x940E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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