Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4debea0c03e09bc…

MALICIOUS

PDF

47.1 KB Created: 2020-08-11 21:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 253a9ebd8de6389aca85a4eb9936f6e5 SHA-1: e3c41acbe2b4e1391fe4ab339c30d0173f751be9 SHA-256: d4debea0c03e09bc0a0d775f7966027d7c52ee981fc2b9ae382f979f96042a11
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated, but the presence of the redirector URL and the link farm suggests a distribution or phishing campaign.

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=just+already+and+yet+pdf
    • http://files.seasoulself.com/uploads/1/3/1/4/131453302/radadi.pdf
    • http://zosov.sankofaoutreach.org/uploads/1/3/2/3/132303382/7548871.pdf
    • http://files.richardmarshall-hardy.com/uploads/1/3/0/8/130874012/32143ebc8df59d.pdf
    • http://files.learninginquirer.info/uploads/1/3/0/7/130740177/9f959503.pdf
    • https://cdn.shopify.com/s/files/1/0438/6498/1664/files/is_roblox_on_xbox_360.pdf
    • https://cdn.shopify.com/s/files/1/0428/7958/2374/files/sewing_to_sell_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/7728/8611/files/prova_de_auditor_fiscal_da_receita_federal.pdf
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/tosedadivowafisat.pdf
    • https://cdn.shopify.com/s/files/1/0439/0807/1576/files/nanalelikurozevalomufu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0111/0940/files/kusobatupewoloturure.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6282/files/7073032672.pdf
    • https://cdn.shopify.com/s/files/1/0428/7735/4143/files/36539196237.pdf
    • https://cdn.shopify.com/s/files/1/0432/7574/7484/files/inglorious_bastards_theme.pdf
    • https://cdn.shopify.com/s/files/1/0435/1547/8176/files/66862741618.pdf
    • https://cdn.shopify.com/s/files/1/0428/1607/7991/files/59135131567.pdf
    • https://cdn.shopify.com/s/files/1/0436/2502/1603/files/homelite_weed_wacker.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d46.bin
3d985d58e0731a1bcb0ee6d607035fa14f676e632fe39d3eb291ec3053009a98
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D46 5128 bytes
font_01_sfnt_off00007ecf.bin
7c0a7f7a0336acd26d1afedbf93ba8916dbbe2546e3fafd5fe99cbb6dac12284
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ECF 18784 bytes