Malicious PDF — malware analysis report

Static analysis result for SHA-256 11553fe9d25c8900…

MALICIOUS

PDF

53.5 KB Created: 2020-08-20 11:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b0863ffb599e41eb4e32776fd5d5c37 SHA-1: 99c0231624f890a2db8cdb63f0c05f1ae092f63b SHA-256: 11553fe9d25c8900e0fc453da5c5a77daac840abf9ec468789b30aa2890c8db4
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 redirector service known to host malicious content. The document body also contains a URL that leads to a redirector, suggesting an attempt to drive traffic to malicious sites. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a link farm or redirection attack.

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=haryana+b.+ed+online+application+form+2018
    • http://ligan.diamondentllc.com/uploads/1/3/1/0/131070767/4735174.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/albinismo_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0428/6647/5174/files/cdc_vaccine_guidelines_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/8792/9252/files/bojipisemotudomutet.pdf
    • https://cdn.shopify.com/s/files/1/0429/6107/6387/files/cubital_tunnel_syndrome_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0433/3436/9438/files/kolamipuso.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/menagalok.pdf
    • https://cdn.shopify.com/s/files/1/0432/0732/7899/files/java_8_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0431/9261/5073/files/14072179057.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/lofebivirusorub.pdf
    • https://cdn.shopify.com/s/files/1/0440/7263/2470/files/74_el_camino.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000708d.bin
01c6d258bc37b5a2cd479800423ae06d7a11a2ba8eb01e4513e220de7c424874
pdf-font-stream PDF embedded font (sfnt) at offset 0x708D 5876 bytes
font_01_sfnt_off00008482.bin
941473045ac316a6fca4c2ba22906fac0e97bc056ce7b64fcaaf6f80dc23775f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8482 15240 bytes
font_02_sfnt_off0000b36e.bin
972acd4207bb929b7a6f6025bf9f9aaee14d96866d9f48beb5603df5d612d6ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xB36E 16188 bytes