Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af24a5bc9e5e1cb…

MALICIOUS

PDF

56.2 KB Created: 2020-08-17 18:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb9d3dc7a8102570248ff41e980bde91 SHA-1: f1ea2156cc808549c4f1ed4ba44583ef1b19850a SHA-256: 5af24a5bc9e5e1cb3c3bec4ddca13bec0207ebadbd0169e90a9cdcdabc1152b2
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to improve search engine ranking for malicious content. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs suggests an attempt to redirect the user to a harmful site.

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.com/pify?keyword=information+asymmetry+real+life+examples
    • http://files.deneiseself.com/uploads/1/3/2/7/132741433/legalejat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9124/5733/files/c_read_text_file_line_by_line.pdf
    • https://cdn.shopify.com/s/files/1/0439/4627/9080/files/ninufilomekojifawuduvap.pdf
    • https://cdn.shopify.com/s/files/1/0431/1960/7965/files/38107714274.pdf
    • https://cdn.shopify.com/s/files/1/0428/8125/3535/files/luzubugixomefatutabudaza.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4585/files/24670768848.pdf
    • https://cdn.shopify.com/s/files/1/0435/5257/1555/files/jadajowawikuvi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/metegemekipezafekude.pdf
    • https://cdn.shopify.com/s/files/1/0430/9811/2167/files/57154559278.pdf
    • https://cdn.shopify.com/s/files/1/0427/8091/7926/files/sakemofafojupijepujotiwo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mubexuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/3305/1814/files/86397107387.pdf
    • https://cdn.shopify.com/s/files/1/0430/6426/2818/files/87375624120.pdf
    • https://cdn.shopify.com/s/files/1/0432/0008/6180/files/gomujuvokafaxadototixa.pdf
    • https://cdn.shopify.com/s/files/1/0441/4462/3768/files/veduvaxafupemufidu.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_off0000988e.bin
ad21a3208c09567a4c0e8b72e7a3c194ab9faec7117e9c37579da6b093660790
pdf-font-stream PDF embedded font (sfnt) at offset 0x988E 5152 bytes
font_01_sfnt_off0000aa08.bin
1b3139104121d9f6c0b1e4f7b17688c8ffa5251134e1579b4feed73b35218e3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xAA08 12976 bytes