Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eea5aa51a68e9ad…

MALICIOUS

PDF

43.5 KB Created: 2020-08-07 02:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf71926dbff67ad636c6748e85e139fd SHA-1: 2f7ab1a075b0f078ffadf92a44299b85e571399f SHA-256: 7eea5aa51a68e9adcda55105103d1439d6a417be36110a51abfa7fb7888c3d46
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 link farm designed for SEO manipulation. One prominent link redirects to a malicious URL, suggesting an attempt to lead the user to a compromised site or phishing page. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=mathematical+biology+textbook+pdf
    • http://files.mccombwholesale.com/uploads/1/3/0/8/130874523/66696087308b750.pdf
    • http://files.leeandpoon.com/uploads/1/3/1/1/131163507/gumogipapose.pdf
    • http://files.makingmathmiracles.com/uploads/1/3/2/7/132710786/9520723.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6305/8333/files/29095924256.pdf
    • https://cdn.shopify.com/s/files/1/0435/1341/3786/files/nuvudupinadivomuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/6830/1212/files/2216763961.pdf
    • https://cdn.shopify.com/s/files/1/0440/8265/9493/files/nevixoza.pdf
    • https://cdn.shopify.com/s/files/1/0430/5344/9367/files/98604112024.pdf
    • https://cdn.shopify.com/s/files/1/0431/4991/8374/files/zawerojapawejo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/mapogoroda.pdf
    • https://cdn.shopify.com/s/files/1/0434/6655/5557/files/74364728918.pdf
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/jawesadiratibopibulutafo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2229/3920/files/90219993765.pdf
    • https://cdn.shopify.com/s/files/1/0440/1774/6070/files/jotikovenusukiworid.pdf
    • https://cdn.shopify.com/s/files/1/0432/7328/9894/files/abandono_infantil_en_el_peru.pdf
    • https://cdn.shopify.com/s/files/1/0434/6337/7048/files/kupevajefi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5823/files/jasekojekeza.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_off0000668c.bin
ef96e2883cf1688ad424ad6317b8e404958bd173fd0ef8b05399dd56df36b9a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x668C 5672 bytes
font_01_sfnt_off000079da.bin
6eb32ed39a970b49f7452ab8a4321f473fba34ff9d4af4415180df11f453f944
pdf-font-stream PDF embedded font (sfnt) at offset 0x79DA 10832 bytes