Malicious PDF — malware analysis report

Static analysis result for SHA-256 80aa750e911b92ea…

MALICIOUS

PDF

41.1 KB Created: 2020-08-31 03:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1490e80ca94779e1f48e3bab5528b9c0 SHA-1: 62b6b2b56d3146063c90e8068d48e197a752516b SHA-256: 80aa750e911b92ea6e4261f243e2b8e7430bf862260efa6f4f3edcad71055b18
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains the URL for the redirector and numerous other URLs, suggesting a link farm or SEO poisoning attempt. 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.ru/wix?keyword=10+day+detox+diet+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5816/6949/files/squarespace_wiki_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/6308/2146/files/gsssb_bin_sachivalay_clerk_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/1184/0927/files/donkey_kong_country_3_roms.pdf
    • https://cdn.shopify.com/s/files/1/0434/8385/7053/files/99777839965.pdf
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/jajuvaxofusadinukovifi.pdf
    • https://cdn.shopify.com/s/files/1/0462/0989/2505/files/19591955861.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8246/files/babudu.pdf
    • https://static.usrfiles.com/ugd/afe78f_041aeee1215447679e5525e7d4028a6e.pdf
    • https://static.usrfiles.com/ugd/a771bd_35fa6322d7e4478180f13e22bc210a2a.pdf
    • https://static.usrfiles.com/ugd/5ad03d_a8ffe389cd63419f85d4e56743778bbb.pdf
    • https://static.usrfiles.com/ugd/a107db_d9f907301eb44a8f9168e0e8469e172a.pdf
    • https://static.usrfiles.com/ugd/6cfc61_499e9ee4b7ed4e38aab0cf899813e44f.pdf
    • https://static.usrfiles.com/ugd/97368a_8a554aaaf7d447bdbe2fccea581120dd.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_off00006335.bin
a04dcbd00156c9c490d04bbb3d272544b0a5625bd821e634c9108cd10380a5ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x6335 4996 bytes
font_01_sfnt_off00007455.bin
682cab1a589222c5b9a156551ac0acdb8b0fb65f9957bb139b8993b108bcd388
pdf-font-stream PDF embedded font (sfnt) at offset 0x7455 10432 bytes