Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20b4b749fa18811…

MALICIOUS

PDF

48.4 KB Created: 2020-11-01 11:30:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a5e579927f8f4f664b69790f7760e9f SHA-1: 71c63b8dfaf34224451ca444c90b8e48ae06c961 SHA-256: e20b4b749fa18811bfd38983f8e0e73657a28047c2f1a0dd19a8ed2bffb6735e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many pointing to other PDFs, indicative of a link farm for SEO manipulation. One critical link directs to a known malicious redirector, suggesting a malicious intent to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=uncharted+waters+online+beginners+guide
    • https://nulumekut.weebly.com/uploads/1/3/4/3/134373747/8c90c65e8f84b.pdf
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/lomogul-pogis-ravivimelako-jakugi.pdf
    • https://wusinetowaje.weebly.com/uploads/1/3/4/4/134471696/8538777.pdf
    • https://xemivigezeb.weebly.com/uploads/1/3/4/4/134481563/3300476.pdf
    • https://ruwitopiramowu.weebly.com/uploads/1/3/4/3/134364975/15970f9.pdf
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/devamet-derekaw.pdf
    • https://vozopameniv.weebly.com/uploads/1/3/4/5/134593493/9974852.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/064d7d45-3d46-41b2-a280-8490e60c2e06/43522364074.pdf
    • https://uploads.strikinglycdn.com/files/84ac56fc-fb39-454c-9d04-e7746927cbf8/hindi_alphabets_pronunciation.pdf
    • https://cdn.shopify.com/s/files/1/0483/9653/3909/files/veroxaxikefoluto.pdf
    • https://uploads.strikinglycdn.com/files/a94a3be4-9303-4a03-a08d-c32225178e16/mosuwaw.pdf
    • https://uploads.strikinglycdn.com/files/4e0a190e-ad9a-4987-801b-fa18202bc815/smt_dx2_tier_list.pdf
    • https://uploads.strikinglycdn.com/files/27302a28-c7d5-438e-8daf-bae3273b7f08/17639024822.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f13.bin
8ae5c5a4f76126ef1c769d8cba11f152725e8203f9ff256648b9134d5fb1fb5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F13 5424 bytes
font_01_sfnt_off00009190.bin
b63c0341c64cfd3388b1a29de1ea0a212ccf9e9fa41511a21c16deae8537238e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9190 10380 bytes