Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b8f8cc7af56ce8…

MALICIOUS

PDF

49.0 KB Created: 2020-08-09 20:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5ecaf75178127bcd99b73755ec2a5ad SHA-1: f4e2acee1be9f61c1b1e794948496317b45fe918 SHA-256: 04b8f8cc7af56ce8e98d51480b9c8d310745bdf5d1f547c7c647078b23f68138
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.com'. The document body, though obfuscated, contains text related to 'Korean alphabet pronunciation pdf' and the URL 'https://ttraff.com/pify?keyword=korean+alphabet+pronunciation+pdf', suggesting a lure to a malicious site. The presence of a large number of external PDF links also indicates a link farm, a common tactic for SEO poisoning and traffic redirection.

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=korean+alphabet+pronunciation+pdf
    • http://files.theatelierllc.com/uploads/1/3/1/3/131382590/b90f573.pdf
    • http://files.aacnationals2016.com/uploads/1/3/2/6/132682851/33538b06.pdf
    • http://files.bitsbridlesbrambles.com/uploads/1/3/1/4/131437701/c641393a.pdf
    • http://files.alllandscapedata.net/uploads/1/3/1/3/131378776/guzaxokawerexasaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/48092442132.pdf
    • https://cdn.shopify.com/s/files/1/0433/3607/3366/files/4762202057.pdf
    • https://cdn.shopify.com/s/files/1/0434/7042/2180/files/99250798460.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3835/files/the_affluent_society_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/7696/6808/files/34734690546.pdf
    • https://cdn.shopify.com/s/files/1/0430/8333/3785/files/40573109138.pdf
    • https://cdn.shopify.com/s/files/1/0428/2456/4902/files/the_abolition_of_man_full_text.pdf
    • https://cdn.shopify.com/s/files/1/0428/6509/8918/files/vajuwujewugopu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1488/1433/files/57705381783.pdf
    • https://cdn.shopify.com/s/files/1/0439/3464/6440/files/volov.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3749/files/74898035786.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069f8.bin
4ac6daa234ac4eff576c9c1fbd8f909bf061f0e8aee6b730f994be56fe86e685		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F8 5172 bytes
font_01_sfnt_off00007b83.bin
b682fddf779da690f572930788d7226cf7df536aa71e600857fbe1fab56d11ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B83 11460 bytes
font_02_sfnt_off0000a266.bin
4c0a3f0893f5e69c6acf0c6b7f036872587aec6188c41bdd40a009ab43c82216		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA266 16060 bytes

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