Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ede817c291d4448…

MALICIOUS

PDF

45.6 KB Created: 2020-08-29 22:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8399440b2088ef1067119b9fddc4b3ca SHA-1: 59d3edcd99cfb7770b78896907cc44d7ceb7b121 SHA-256: 0ede817c291d44488b88dfc066a51be55ffb6bd9b9e26a8518975a6d0c1c8104
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL and appears to be part of a link farm designed to lure users. The ML classifier strongly indicated maliciousness, supporting the redirector finding.

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/wix?keyword=carnot+heat+engine+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/lejum.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/jukovivek.pdf
    • https://cdn.shopify.com/s/files/1/0431/3835/1255/files/new_cutting_edge_pre_intermediate_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/93467974983.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9115/files/vajozuriwopudekilux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0553/3598/files/lixefatitunamolasidates.pdf
    • https://cdn.shopify.com/s/files/1/0448/0807/7473/files/open_e_aadhar_card_download_file_password.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7816/files/unix_linux_administration_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/takexutoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/23470666773.pdf
    • https://cdn.shopify.com/s/files/1/0430/3159/3113/files/xawinipefakuxepa.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_off00006f8b.bin
c235db8ad411c2229708c740f803bceb3cd9f9cd26735e7263508817bb009159
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8B 5000 bytes
font_01_sfnt_off00008086.bin
0f4f778f23b40b059f3bcb9b52682f54ba331511ad443a9cdf594a81f281dc73
pdf-font-stream PDF embedded font (sfnt) at offset 0x8086 12924 bytes