Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8a93e7ea99d8a5…

MALICIOUS

PDF

42.7 KB Created: 2020-11-04 04:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a25ef9a5b8a8251d1b95ddd28c63923f SHA-1: 13e847aefecd4edf90e83751cb3e97d1d0cc2f4a SHA-256: 8b8a93e7ea99d8a5de8d5708fbd9722ef34f1aa033a67fde6bc519c144a72454
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with keywords related to 'Bramblestar and squirrelflight warrior cats'. The document also functions as a link farm, pointing to numerous other PDF files, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness.

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://gettraff.ru/123?keyword=bramblestar+and+squirrelflight+warrior+cats
    • https://xelegiri.weebly.com/uploads/1/3/4/4/134435730/8565423ff7.pdf
    • https://cdn-cms.f-static.net/uploads/4408478/normal_5f9d5f7139be5.pdf
    • https://fevanigazotife.weebly.com/uploads/1/3/4/3/134376534/dekukuxuxed.pdf
    • https://korebamo.weebly.com/uploads/1/3/0/7/130739662/1dca2a88cdf8134.pdf
    • https://ruwopevod.weebly.com/uploads/1/3/1/3/131397973/42331.pdf
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f8719c9f0e7f.pdf
    • https://cdn-cms.f-static.net/uploads/4408180/normal_5f972740802a8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mozirolinitaje/gastrulation_in_mammals.pdf
    • https://uploads.strikinglycdn.com/files/707c2adc-101b-49f6-9c3a-f466822fed1e/mudukoz.pdf
    • https://cdn.shopify.com/s/files/1/0483/8929/2184/files/vizidagapugamutoje.pdf
    • https://s3.amazonaws.com/susopuzupure/spanish_bilingual_dictionary.pdf
    • https://uploads.strikinglycdn.com/files/9cfa7448-4e4d-4f68-99b4-59ab8eb018c3/gloomhaven_cragheart_tank_build.pdf
    • https://s3.amazonaws.com/juduk/senryuu_shoujo_manga_rock.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fbc.bin
5afed12925ebb3c09c5f8e81bcb9b8e2fbd2f966f6aff726a64a01b89f689d8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBC 5840 bytes
font_01_sfnt_off00007372.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
pdf-font-stream PDF embedded font (sfnt) at offset 0x7372 1800 bytes
font_02_sfnt_off00007bfe.bin
ba2844b4b5cff176d1c1b4d4f0ed86eeb2802bd17628d9b70e4a31ac7ece976e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BFE 9852 bytes