Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ad0f15c663a384…

MALICIOUS

PDF

40.2 KB Created: 2020-09-17 00:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7517b4a9ef69d226db44d27a71a4c58 SHA-1: b426607dbb8e82bd24fde56322503bfcd780b2d2 SHA-256: 85ad0f15c663a384240a6ad3c5488f2658c4c97066273b578e5d56bae0b73310
154 Risk Score

Malware Insights

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

This PDF document contains a link to a known malicious redirector, ttraff.me, which is likely intended to lead the user to a malicious site. The document also contains a large number of embedded links to various PDF files, suggesting a link farm or a method to obscure the true malicious destination. 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://ttraff.me/wix?keyword=cs+164+berkeley
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://73ae9a4d-3a7e-4c9f-9a26-0902c9594636.filesusr.com/ugd/d162e3_a8d432b3594e4dc2b17d4d21dd330e75.pdf?index=true
    • https://35f9ba00-af64-43ae-bf13-617d8d87136b.filesusr.com/ugd/b1b3ad_25b9455a361c439880989e6e1d6cc538.pdf?index=true
    • https://db065e71-2c86-4a6d-85e4-a55ca35ccdd1.filesusr.com/ugd/3254bf_5c9de33a5b914c188dae55ef87ae6989.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0479/5190/4924/files/19308314128.pdf
    • https://cdn.shopify.com/s/files/1/0428/8842/9724/files/mangrove_rhizophora_apiculata.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofusibosaduxigagixuvoma.pdf
    • https://cdn.shopify.com/s/files/1/0437/7391/9393/files/36151292283.pdf
    • https://cdn.shopify.com/s/files/1/0437/1732/9064/files/delivery_note_excel_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/9649/0655/files/1708939273.pdf
    • https://cdn.shopify.com/s/files/1/0434/7104/4774/files/crack_gta_v.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9215/files/20_amino_acids_list.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/sopepaj.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_off00005f35.bin
6be734d79ae8a6316363a42ed5be5444464036ff5f9b50068b93ae720df783f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F35 4976 bytes
font_01_sfnt_off00007049.bin
7fa29e9f7585bcc25ca3d279ec62b5f859e93f0d5f5da00617f94d70e4307f9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7049 10732 bytes