Malicious PDF — malware analysis report

Static analysis result for SHA-256 79576c2a38c33076…

MALICIOUS

PDF

39.9 KB Created: 2020-08-20 18:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4be9d46040c45808c81318825aa3f925 SHA-1: c454775d2497c43390bb9bba5744292aac039640 SHA-256: 79576c2a38c33076a76faea54d7948c0f4c511ab547d28cf6171d29a853403e6
154 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to a malicious URL, disguised as homework answers. The ML classifier strongly indicates maliciousness, and the presence of numerous external links, including a redirector, supports a phishing or scamming attack pattern. No scripts were extracted, but the document's structure and embedded links are sufficient to infer a malicious intent.

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=go+math+grade+5+homework+answers
    • http://natidida.hire-alicia.com/uploads/1/3/1/6/131637457/6804115.pdf
    • http://files.whenthingsgowrongmovie.com/uploads/1/3/0/9/130969999/2949404.pdf
    • http://files.glowmedspacc.com/uploads/1/3/0/7/130740298/32b2eafea29052.pdf
    • http://pigoz.simonperathoner.com/uploads/1/3/2/3/132303054/3546616.pdf
    • http://files.benbodnarfilms.com/uploads/1/3/0/8/130814706/satotubuzelizen_mesarojaselas_desuluwino.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8764/3302/files/77337429965.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8542/files/besopube.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/10699911966.pdf
    • https://cdn.shopify.com/s/files/1/0431/0253/5840/files/gasekewimixafisawu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1135/0439/files/catalogue_samsung.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2217/files/82226145958.pdf
    • https://cdn.shopify.com/s/files/1/0439/5050/6152/files/65862149879.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_off00005e1f.bin
697d919f944b37f2908f81a6c76504aab887b45b32fc8dfd6c8d41e61a6d6459
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1F 5520 bytes
font_01_sfnt_off000070d3.bin
ea5043fe7fcad9c2e5200d7a2ae2e32e99cca2d7b56e2c53f476f06c4663fed7
pdf-font-stream PDF embedded font (sfnt) at offset 0x70D3 9988 bytes