Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a396bf16c5b891…

MALICIOUS

PDF

37.2 KB Created: 2020-08-15 01:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb96fef6cf8d8b782a2b79a91ecff64e SHA-1: d059259c08096e2ac05c00689f7a074f82a89cc5 SHA-256: 09a396bf16c5b891d5d48fc06d1c8252b46ae3c50aa1f15c18184f924b58d5e2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external resources, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users to malicious sites, potentially for phishing or to download further malware.

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.ru/wb?keyword=inference%20questions%20worksheets
    • http://files.wordplaygifts.com/uploads/1/3/2/6/132695707/01246ed0.pdf
    • http://files.villageoffenney.com/uploads/1/3/0/7/130775856/9114901.pdf
    • http://jotijove.bonedaddycrafts.com/uploads/1/3/1/3/131379552/e475f72707a5a.pdf
    • http://files.spectorlondon.com/uploads/1/3/1/0/131070362/7704417.pdf
    • http://vufugokoz.fossellfuel.com/uploads/1/3/1/1/131163635/towaxo_neritizalejideg_tiwigare_putip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3164/8661/files/introduction_to_boundary_element_method.pdf
    • https://cdn.shopify.com/s/files/1/0437/6225/3978/files/44532748033.pdf
    • https://cdn.shopify.com/s/files/1/0429/4872/2851/files/disagonedefobetebekeba.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3772/files/57377327792.pdf
    • https://cdn.shopify.com/s/files/1/0432/6070/6971/files/23513568061.pdf
    • https://cdn.shopify.com/s/files/1/0440/1351/9006/files/jomovumijemexedaramif.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0865/files/editing_documents_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/9177/7952/files/americanah_summary.pdf
    • https://cdn.shopify.com/s/files/1/0434/5610/2565/files/lizekibezu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5107/2158/files/javitanugumuse.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_off000053ca.bin
ee8e1847ef55636c3110ad89621151c81f15af06d1dd34a3c2b64a85216fafa1
pdf-font-stream PDF embedded font (sfnt) at offset 0x53CA 4948 bytes
font_01_sfnt_off000064b1.bin
e4c31aa30140cb74c02314bef83b866a3bf48ef805c6eef91361074453963fd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x64B1 10360 bytes