Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7a7af34c84ff8f…

MALICIOUS

PDF

39.2 KB Created: 2020-08-18 15:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2117815b3ed790946dd2e9bd9a0a6bc8 SHA-1: b22684f45043209b561c13e4f2eca692fd6afe60 SHA-256: 9a7a7af34c84ff8fb2b0e391876e086b0b94e2a11799fdea86f4c39a97b437ee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that is disguised as a presentation template. The document body also contains this URL. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, some of which lead to potentially malicious infrastructure. The ML classifier strongly flagged this PDF as malicious.

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=case+study+presentation+template+ppt
    • http://mopapi.sedonaweddingessentials.com/uploads/1/3/2/6/132681352/4767104.pdf
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/campanella_liszt.pdf
    • https://cdn.shopify.com/s/files/1/0432/7545/2569/files/perl_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/cantaloupe_island_tabs.pdf
    • https://cdn.shopify.com/s/files/1/0428/6427/9718/files/uninstall_eclipse_mac.pdf
    • https://cdn.shopify.com/s/files/1/0430/6904/6935/files/nunonil.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/15462322196.pdf
    • https://cdn.shopify.com/s/files/1/0449/9632/9636/files/conquering_carpal_tunnel_syndrome_and_other_repetitive_strain_injuries.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/gukusa.pdf
    • https://cdn.shopify.com/s/files/1/0437/3702/2615/files/wakigaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/9394/1671/files/akuntansi_syariah_jurnal.pdf
    • https://cdn.shopify.com/s/files/1/0433/3659/7654/files/lobowubuvudikuxiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0813/files/75548304617.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005aa8.bin
5c395ec3f073c011f5d7aa02571e7dce2d43ce419455880b672e95f49196d8ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA8 5112 bytes
font_01_sfnt_off00006bf4.bin
c09f968ea7769c5dca13fa5a15164dd42ddfe4214e33da5018fb344f51c67c07
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF4 10580 bytes