Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a62ae2762fa7667…

MALICIOUS

PDF

93.3 KB Created: 2020-08-26 22:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7164c32dc61f12a3c871d3d14e95a4bb SHA-1: 096b6a5fb064f5896d16d21461c0feaa36fabff8 SHA-256: 0a62ae2762fa7667cc0dda6a9de7ea64745ce4bfcdb6face1b5318c27430e12c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through numerous links.

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.me/pify?keyword=dominios+y+clases+nanda
    • http://files.hickscharolais.com/uploads/1/3/1/3/131380966/8505752.pdf
    • http://bavasu.totsandco.org/uploads/1/3/0/7/130776089/zuwir-gilatewil-sisas-fajid.pdf
    • http://files.bayorchestra.com/uploads/1/3/1/0/131070212/wibakajezijo-jidovezeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3564/0487/files/77286853930.pdf
    • https://cdn.shopify.com/s/files/1/0433/0559/9140/files/kukogasevuwetawetazezune.pdf
    • https://cdn.shopify.com/s/files/1/0432/9055/8622/files/39054361762.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6467/files/918619478.pdf
    • https://cdn.shopify.com/s/files/1/0432/3472/1959/files/eftps_worksheet_short_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dekafarisajanitid.pdf
    • https://cdn.shopify.com/s/files/1/0433/7542/7735/files/posiregivepobukotoxezan.pdf
    • https://cdn.shopify.com/s/files/1/0434/9086/9410/files/49849488497.pdf
    • https://cdn.shopify.com/s/files/1/0429/9892/3427/files/lonano.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1326/files/liwixo.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_off00012672.bin
126230a2719cc337f389f196499297722621377c270dd0bfd04676d98a6cef11
pdf-font-stream PDF embedded font (sfnt) at offset 0x12672 5088 bytes
font_01_sfnt_off000137ad.bin
74bd9d40fd8782c692b7e929253344858077734da530997886ac0d31e53e3e24
pdf-font-stream PDF embedded font (sfnt) at offset 0x137AD 15508 bytes