Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ebd466aafd838ba…

MALICIOUS

PDF

33.5 KB Created: 2020-08-07 17:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d59d41440eb0f9fef708dc5c4cabb98 SHA-1: f016d4b28d4334807bc0c51b53f59fa57d70de13 SHA-256: 0ebd466aafd838bada27f1d40886440316623450ffe320b6e6e03674d238efc6
154 Risk Score

Malware Insights

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

The PDF document contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious infrastructure. Additionally, PDF_SEO_LINK_FARM suggests a large number of external PDF links, likely to manipulate search engine results or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs, particularly the one on ttraff.ru, are the primary indicators of malicious intent.

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/pify?keyword=andres+bello+libros+pdf
    • http://winanefi.canappelafarm.com/uploads/1/3/2/6/132681556/45092f90a4916.pdf
    • http://files.saborlatinotacuari.com/uploads/1/3/2/6/132695329/kikizazerepekesomak.pdf
    • http://files.eversdalgymnastics.com/uploads/1/3/1/0/131071035/lilebikop.pdf
    • http://files.moldin.net/uploads/1/3/1/4/131453432/4614465.pdf
    • http://files.booncompanionsgoatclub.com/uploads/1/3/1/3/131380728/624933.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20745245188.pdf
    • https://cdn.shopify.com/s/files/1/0434/6737/4758/files/xepimapegerukelorak.pdf
    • https://cdn.shopify.com/s/files/1/0436/9540/7269/files/audi_a4_b6_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/7121/7565/files/46213895913.pdf
    • https://cdn.shopify.com/s/files/1/0436/3023/1712/files/pinukalupefu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1642/1529/files/gatidogerejuza.pdf
    • https://cdn.shopify.com/s/files/1/0431/0486/2374/files/38066904742.pdf
    • https://cdn.shopify.com/s/files/1/0432/4645/2899/files/normalizer_and_centralizer_in_group_theory.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0413/files/nusajubanepi.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_off00004553.bin
7e151939e621af982d162787db3dd1857cb0eaf174961c10c72452eba9105417
pdf-font-stream PDF embedded font (sfnt) at offset 0x4553 4952 bytes
font_01_sfnt_off00005634.bin
69aab424dfa4dfbc7dc7f6fdfc01880aa1ab6f2aa4b6675506a55ec332d36716
pdf-font-stream PDF embedded font (sfnt) at offset 0x5634 10372 bytes