Malicious PDF — malware analysis report

Static analysis result for SHA-256 65caf9050cf52a21…

MALICIOUS

PDF

51.7 KB Created: 2020-08-23 17:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aec6a5e26d24b5adf3550775a6f12fad SHA-1: 5989b5f217ed3cf4aad0350e386fc84b9d1057aa SHA-256: 65caf9050cf52a2181448a2ba3b59bfdf99f7f318d80a91eeb5d847949c39f6a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.com/pify?keyword=battlefield+3+multiplayer+free`. Additionally, it features a PDF link farm with numerous external links, many hosted on Shopify, suggesting an attempt to distribute or redirect to other malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=battlefield+3+multiplayer+free
    • http://files.clowncabaretnight.com/uploads/1/3/1/4/131408103/wanobinogijagu-nibededo-gajojorak.pdf
    • http://negal.drjenniferawe.com/uploads/1/3/1/4/131438500/f16dfb010.pdf
    • http://files.elitesalonspaelma.com/uploads/1/3/0/9/130969999/80880.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6345/1560/files/xesagosusubonubinabixero.pdf
    • https://cdn.shopify.com/s/files/1/0438/8651/0232/files/98876524693.pdf
    • https://cdn.shopify.com/s/files/1/0434/0498/4483/files/nananekibore.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9842/files/17585604472.pdf
    • https://cdn.shopify.com/s/files/1/0431/7957/3408/files/download_biochemistry_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0434/0989/9670/files/bamamavisolo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7310/files/dokapipiwuvix.pdf
    • https://cdn.shopify.com/s/files/1/0435/5840/4245/files/tetidalemawofixogo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5193/2056/files/wezuwawuzavug.pdf
    • https://cdn.shopify.com/s/files/1/0437/6271/2727/files/blank_flashcard_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6055/files/gifts_for_christmas_2015.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_off00008a79.bin
e2e995b5fce2fc57b8ad0d7a5aed60b95b35cf89ea7f8c74eb451cc41147b227
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A79 5324 bytes
font_01_sfnt_off00009c8c.bin
c7f91879901620c0e82b37dfce31698df7f0893eac60224044a47ac4fd72b5cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C8C 10952 bytes