Malicious PDF — malware analysis report

Static analysis result for SHA-256 632b381bacb3b499…

MALICIOUS

PDF

41.6 KB Created: 2020-08-26 21:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 778ffa5c90afa0b3db3869aaa1ef87c8 SHA-1: 084340f72e44e441790d5830e5ab36674b27f596 SHA-256: 632b381bacb3b499f57ee776c9b9991f61c2cec10950e549755e18d60bf89480
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to link farms and at least one known malicious redirector. The document body, though partially obfuscated, includes a URL that is also flagged as a malicious redirector. This suggests the primary goal is to drive traffic to malicious infrastructure, likely for further exploitation or phishing.

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.club/pify?keyword=cuales+son+las+magnitudes+fundamentales+y+derivadas
    • http://zekikero.yosemitepet.com/uploads/1/3/1/6/131606457/6958573.pdf
    • http://files.gtfamilylifecenter.com/uploads/1/3/0/7/130739780/332306.pdf
    • http://famopewaw.agsorette.com/uploads/1/3/1/4/131453133/duvumosepobadovewat.pdf
    • http://vizuta.downeastphotographers.com/uploads/1/3/1/3/131383483/mojaritudidafigab.pdf
    • http://files.limberlostmusic.com/uploads/1/3/1/4/131437680/be11f04a437d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0451/0887/files/algebra_1_textbook_prentice_hall_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5529/2317/files/google_sheets_vs_excel_market_share.pdf
    • https://cdn.shopify.com/s/files/1/0435/5820/7651/files/abordagem_comunicativa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4896/7061/files/bunejelowemu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4399/files/vukuzilikuninum.pdf
    • https://cdn.shopify.com/s/files/1/0431/0990/8637/files/degevelok.pdf
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/21435827868.pdf
    • https://cdn.shopify.com/s/files/1/0440/5103/8358/files/55920401518.pdf
    • https://cdn.shopify.com/s/files/1/0434/5964/1496/files/34573450676.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_off00006129.bin
eed3967f81b91b015c87c32562f54f77d633d9a77cb97449bbc9302fa197c5f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6129 5292 bytes
font_01_sfnt_off00007322.bin
adaa0b78ad7584e2772d6a810dd44338a53613303ddc1377ba21a65d7b4178b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7322 11840 bytes