Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c86365a71942f4…

MALICIOUS

PDF

53.3 KB Created: 2020-08-13 12:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff62d63c55f333cd994d24c9ba776103 SHA-1: 982ea25ff9c0aac7cb3638c757689d536c5bfc71 SHA-256: 16c86365a71942f41a89ac41e8b122d5aad367c8a6635980b764bab694d61639
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious domains. The ML classifier strongly indicates maliciousness. The document body itself appears to be malformed or obfuscated, but it does contain a URL that matches one of the heuristic findings, suggesting an attempt to disguise malicious links within the document 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.ru/wb?keyword=enfermedad%20de%20meniere%20pdf%20medigraphic
    • http://juxiwo.mplhk.org/uploads/1/3/2/8/132816066/c8656e387.pdf
    • http://jijow.brittanyrawls.com/uploads/1/3/1/6/131637149/puwefokivira_jebarolasob_tenuzapog_wipuvikubuzop.pdf
    • http://jeruke.lilcreates.com/uploads/1/3/2/8/132814930/tamovi.pdf
    • http://files.nevadalifeinsurancebrokers.com/uploads/1/3/0/7/130739713/pezisanojupamu_wekopawo_bipepivabef_lokosaxiruf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1352/8987/files/20638811768.pdf
    • https://cdn.shopify.com/s/files/1/0440/1987/5998/files/nonofakebelexawaledufavas.pdf
    • https://cdn.shopify.com/s/files/1/0434/5757/7122/files/nitererikefop.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2042/files/84475108987.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/govuwejujuwe.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/2818930821.pdf
    • https://cdn.shopify.com/s/files/1/0437/5812/5207/files/tixubozekuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/0432/0154/files/kapununo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/paletewojukenoso.pdf
    • https://cdn.shopify.com/s/files/1/0433/1637/9816/files/luzufinitaxame.pdf
    • https://cdn.shopify.com/s/files/1/0435/2131/0880/files/sovuwimobi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38967404473.pdf
    • https://cdn.shopify.com/s/files/1/0436/0021/6232/files/wobenigaz.pdf
    • https://medlineplus.gov/spanish/menieresdisease.html
    • 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_off000091ab.bin
4e34cbe1b6b4dd76630139010b11e57f5bfa91b6d3567d3f9e42da33caff0d75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91AB 5316 bytes
font_01_sfnt_off0000a394.bin
d5fd1976254a4b702ecb988342648f50d9e0b713354465b306fa71385bff5ee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA394 10804 bytes

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