Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a266c732419ebb…

MALICIOUS

PDF

45.3 KB Created: 2020-08-08 19:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ba5b36d9cf0a90e0f127031a7fceff8 SHA-1: 0eb66a23f79562c49c0ef3c232b86e57187b9c04 SHA-256: 17a266c732419ebbd2252a20e1fb85700cc9dcb150ad02dadd490b297b401339
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 a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'accessories vocabulary pdf' and includes the malicious URL. The presence of many external PDF links suggests an attempt to manipulate search engine results or direct users to malicious 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=accessories+vocabulary+pdf
    • http://files.thelearningcornerpreschool.com/uploads/1/3/2/6/132681796/tobewupuv.pdf
    • http://files.lbf1997.org/uploads/1/3/2/6/132682113/xufotedoxafuk.pdf
    • http://files.designby-faith.com/uploads/1/3/0/8/130814058/xaxikekexoxakeda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4776/4636/files/resident_evil_5_infinite_ammo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6237/8152/files/15382262478.pdf
    • https://cdn.shopify.com/s/files/1/0435/4070/9527/files/generate_random_string_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/15870699981.pdf
    • https://cdn.shopify.com/s/files/1/0437/3141/9287/files/25478378613.pdf
    • https://cdn.shopify.com/s/files/1/0429/7487/1711/files/jixozozogosaroziburig.pdf
    • https://cdn.shopify.com/s/files/1/0428/8898/6787/files/47175904174.pdf
    • https://cdn.shopify.com/s/files/1/0431/8982/9800/files/kurixofomomubixafenoxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/75814413687.pdf
    • https://cdn.shopify.com/s/files/1/0438/4443/6128/files/58694525398.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_off000070ff.bin
1f56093a309c584ba8dcb7389c5db1f46e17c40f703aec124e21c7d29293b9b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x70FF 5440 bytes
font_01_sfnt_off0000839b.bin
b47acb9c7b812c74261ad11aa5af9e2e5bfcc8962f479ef998fc94f2a37daf58
pdf-font-stream PDF embedded font (sfnt) at offset 0x839B 10760 bytes