Malicious PDF — malware analysis report

Static analysis result for SHA-256 143b1f8a6d97f0ea…

MALICIOUS

PDF

45.8 KB Created: 2020-08-02 07:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05d9e82e5ca35dd9643bdeb487531449 SHA-1: ae96a22bf1306941e1a3f70cf201a521d887cd64 SHA-256: 143b1f8a6d97f0ea36a0868c4a32e3f0968a55fefe2a14c24d06b5e83e3197f2
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 a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to generate traffic or SEO manipulation for malicious purposes.

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=wordpress+loop+custom+post+type
    • http://files.miazaros.com/uploads/1/3/1/4/131408798/pofexa.pdf
    • http://files.daphnefatterphd.com/uploads/1/3/0/7/130775280/kikorozodegab-xelixi.pdf
    • http://files.muskmeloncreative.com/uploads/1/3/2/7/132741225/7915727.pdf
    • http://files.tatumbarbaree.com/uploads/1/3/1/3/131383959/gipugulimimefi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tipibag.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9938/files/download_gif_from_url.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51106899687.pdf
    • https://cdn.shopify.com/s/files/1/0440/8115/2152/files/77723527531.pdf
    • https://cdn.shopify.com/s/files/1/0431/6610/5759/files/xobegijobimunedipupika.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wotedosepano.pdf
    • https://cdn.shopify.com/s/files/1/0430/5027/0869/files/nimeluvusomogimerurovexib.pdf
    • https://cdn.shopify.com/s/files/1/0428/0123/4076/files/xesefameviris.pdf
    • https://cdn.shopify.com/s/files/1/0433/7244/5846/files/3410800233.pdf
    • https://cdn.shopify.com/s/files/1/0428/8610/3207/files/klipsch_g_28.pdf
    • https://cdn.shopify.com/s/files/1/0430/3772/0733/files/dutugigelatikosuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/8911/6836/files/lawifuxumapilasipef.pdf
    • https://cdn.shopify.com/s/files/1/0431/1344/7581/files/fikolixedesexobav.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dewubi.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_off000073a9.bin
87d64ce74f39f08e6dd99f8f5f99436379223628823c2e507773dc033180b9c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A9 5124 bytes
font_01_sfnt_off00008518.bin
5bb13e98f33047650515d2514b65170a76edf9b4ec313d75fe8cd399880016ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8518 11044 bytes

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