Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e93c33a6e2d9ba…

MALICIOUS

PDF

53.6 KB Created: 2020-07-28 06:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93c47048f9e855b9f8d60ccdc4727af7 SHA-1: 0a24a4c396fea9c3e0f351e95522be5dbe6b0797 SHA-256: 74e93c33a6e2d9bae3d58ac8171496770423da1d1d38691b62736510ab6f96b2
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier also flagged the PDF as malicious. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its direct user-facing purpose, but the link farm and redirector heuristic strongly suggest a malicious intent, likely to drive traffic to malicious infrastructure or for SEO abuse.

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.ru/wb?keyword=manual%20transmission%20remote%20start%20relay
    • http://files.stephenwarrenassociates.co.uk/uploads/1/3/1/6/131636728/gasemijijigifoxofeb.pdf
    • http://files.ilovemytemple.com/uploads/1/3/0/8/130874231/tokaxusifukasix_xusifefojuf.pdf
    • http://files.webuysouthernmdhomes.com/uploads/1/3/1/4/131409794/828471.pdf
    • http://files.lauraavnaim.com/uploads/1/3/1/0/131070851/9e32ceab78d531f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7106/9594/files/23851129895.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1097/files/lenoxajawut.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6651/files/19407968512.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/balev.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lokilus.pdf
    • https://cdn.shopify.com/s/files/1/0435/1626/4616/files/vuweduvedesod.pdf
    • https://cdn.shopify.com/s/files/1/0439/3140/2395/files/45172638268.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/73389168743.pdf
    • https://cdn.shopify.com/s/files/1/0428/5064/8223/files/junisat.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3820/files/90791707428.pdf
    • https://cdn.shopify.com/s/files/1/0429/8211/3433/files/bilagedo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4444/6118/files/15790572701.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_off00009572.bin
0a84b91c79cc7e6ae573f3d9e323fc310c50d6f9b2a9693a6c8d291a301e1164
pdf-font-stream PDF embedded font (sfnt) at offset 0x9572 4820 bytes
font_01_sfnt_off0000a5bd.bin
d3f62778262d1c82081852a3a9a7cc2e29debccfca93548f361b5025dd543900
pdf-font-stream PDF embedded font (sfnt) at offset 0xA5BD 10388 bytes