Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a7661ea8de060f…

MALICIOUS

PDF

46.3 KB Created: 2020-08-15 09:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 522498227054b9f0cb42b9dd8348fdb2 SHA-1: 18bcd32deaf23421b3f798527b5322426612207b SHA-256: 03a7661ea8de060fd969ccde67390ced3dc11726e6542dc47ad1b369b030fc1b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded URLs, many of which are part of a link farm, suggesting an SEO manipulation or content hosting scheme. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a potential for malicious redirection. 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/wb?keyword=funcionalismo%20filosofia%20pdf
    • http://raduri.communityprepalumni.com/uploads/1/3/0/9/130969724/3441496.pdf
    • http://files.aubreyportercreations.com/uploads/1/3/0/8/130874254/todudimubeperiborav.pdf
    • http://files.gesamtschule-kunow.net/uploads/1/3/0/9/130969356/f44b3af3f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1164/4324/files/16114741296.pdf
    • https://cdn.shopify.com/s/files/1/0430/9552/3485/files/zadujazifu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3028/files/18026564350.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9308/files/kolujax.pdf
    • https://cdn.shopify.com/s/files/1/0427/8845/4559/files/97410064643.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1079/files/digital_currency_definition.pdf
    • https://cdn.shopify.com/s/files/1/0431/4788/6743/files/aeolus_air_curtain_fm_1509.pdf
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/83132797085.pdf
    • https://cdn.shopify.com/s/files/1/0439/3458/0891/files/didanikafo.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_off00007393.bin
16a708da9b07bfaf0614017d5d033bf8e05b9c998d8eb0e18e9cdb53e10331f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7393 5160 bytes
font_01_sfnt_off00008511.bin
97ada7c165ae46451d8e183da5557d4c03fcbc08515d0d05e6631700f0c8dba0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8511 12628 bytes