Malicious PDF — malware analysis report

Static analysis result for SHA-256 70bf272ad739ab0c…

MALICIOUS

PDF

34.8 KB Created: 2020-08-10 22:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a0d31173e86bc6ce917c63f8d6ce940 SHA-1: 8886e98142c6f8424836c2e08c4640a475ac582a SHA-256: 70bf272ad739ab0c4e6b7ff4328c07656cd46c4326cf333578084393c53893c1
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector at ttraff.com, disguised with a title related to juvenile delinquency. The presence of many external PDF links suggests a link farm or SEO poisoning attempt. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a malicious intent to redirect users to potentially harmful content.

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=juvenile+delinquency+a+sociological+approach+pdf
    • http://files.natashahoffmanbooks.com/uploads/1/3/1/4/131438313/sarodixe.pdf
    • http://files.morganizephoto.com/uploads/1/3/1/4/131438313/dukijot-kurijol.pdf
    • http://vamaramoj.tinydeathmachine.com/uploads/1/3/2/8/132814930/3b1993ae5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6853/8521/files/hunter_preraid_bis.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9143/files/3414293569.pdf
    • https://cdn.shopify.com/s/files/1/0434/0046/2501/files/zasetowedi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7861/5189/files/pimotimotepabowagawe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6374/6453/files/charge_blade_combos.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3031/files/75905462479.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1657/files/buck_converter_design_equations.pdf
    • https://cdn.shopify.com/s/files/1/0435/5892/8545/files/carcassi_etude_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tuwupijisunuxavupo.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_off000049da.bin
845fb5dffa2cf197625cf41bfb0f5df8756c04d9fc2c06caa9cd618ab7562f20
pdf-font-stream PDF embedded font (sfnt) at offset 0x49DA 5692 bytes
font_01_sfnt_off00005d3f.bin
6cf7fdd2e71144ff6225369e40107ca4c3ab08b480d26d168ea1251477016f89
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3F 9724 bytes