Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d3401403c4e1ea…

MALICIOUS

PDF

57.3 KB Created: 2020-08-10 00:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f709db631fd31a04a887590fadf56bc7 SHA-1: 55fd6fdd7676fa35666ee3efbb638ac2ac01fa23 SHA-256: 14d3401403c4e1eaf27fdfa4a063c59178edaff41071d11b57f13a9182a42403
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The primary malicious link identified is https://ttraff.com/pify?keyword=medicinal+benefits+of+bitter+leaf+pdf, which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to external sites. 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.com/pify?keyword=medicinal+benefits+of+bitter+leaf+pdf
    • http://files.knightsschool.com/uploads/1/3/2/6/132695719/mowutabix_loseme_sadatilu_xosivira.pdf
    • http://files.beepeeking.com/uploads/1/3/1/1/131163540/medoto.pdf
    • http://files.stdymobn.com/uploads/1/3/1/4/131453268/8310312.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/6122/7169/files/lion_otter_beaver_retriever_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niwaxesajikibulunetegidu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7202/7814/files/52938490735.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5612/files/guxarotaxuma.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3772/files/denubol.pdf
    • https://cdn.shopify.com/s/files/1/0433/8122/7672/files/jokonepunojuwuwalide.pdf
    • https://cdn.shopify.com/s/files/1/0433/3545/0774/files/21723543023.pdf
    • https://cdn.shopify.com/s/files/1/0430/7841/8583/files/pexuj.pdf
    • https://cdn.shopify.com/s/files/1/0435/4660/7784/files/89200797570.pdf
    • https://cdn.shopify.com/s/files/1/0438/2215/3890/files/vixogazegado.pdf
    • https://cdn.shopify.com/s/files/1/0440/7197/7110/files/beyondpay_login_easter_seals.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_off00009bea.bin
f32efdfb20cc9cec0340dbc5726b8b846e3c18d206b1487b4b94693ae7c4c51f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BEA 5292 bytes
font_01_sfnt_off0000adfd.bin
db1ba18624513217bbef0b2a127ab823912f325a8627af685070218b82b83168
pdf-font-stream PDF embedded font (sfnt) at offset 0xADFD 13208 bytes