Malicious PDF — malware analysis report

Static analysis result for SHA-256 1364864cae0cc749…

MALICIOUS

PDF

41.9 KB Created: 2020-08-30 22:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86596f799380006440c19cc1e48f1637 SHA-1: f151f91710214195342ae7ff6f83aa4978b0ee69 SHA-256: 1364864cae0cc74917150688520fff1d368890a3209f23b0fb5d7cf619327a31
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector infrastructure at 'https://ttraff.club/wix?keyword=subtraction+worksheets+for+grade+2+1'. The document body, though heavily obfuscated, appears to contain references to educational content and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier 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.club/wix?keyword=subtraction+worksheets+for+grade+2+1
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7730/4481/files/que_es_psicologia_cognitiva.pdf
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/kidepadetir.pdf
    • https://cdn.shopify.com/s/files/1/0430/1750/2869/files/mexexisizaverotipe.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c31454b5c9f4623b96c73110c8518bf.pdf
    • https://static.usrfiles.com/ugd/724bd4_71c3c1883d6948558d29dcbe040bb345.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8472/files/kanunadadizikekodad.pdf
    • https://cdn.shopify.com/s/files/1/0430/9050/9977/files/1355460460.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/pokikuranudujuritit.pdf
    • https://cdn.shopify.com/s/files/1/0434/6209/9109/files/gameze.pdf
    • https://cdn.shopify.com/s/files/1/0434/1560/1319/files/kiwulejazazo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/peaky_blinders_season_2_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2006/files/wojufeduzasuxebexaxago.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_off000064dd.bin
abd485eb41cabaab4a2bf4b44d8c1cd67bd1fad67766a568de5aa5652730cbe0
pdf-font-stream PDF embedded font (sfnt) at offset 0x64DD 5832 bytes
font_01_sfnt_off000078c8.bin
eb617d57404a56cfa1bc05f65c38ec0bba365a33110d4131a7cec2363634d173
pdf-font-stream PDF embedded font (sfnt) at offset 0x78C8 10012 bytes