Malicious PDF — malware analysis report

Static analysis result for SHA-256 50dc4becf159cfe7…

MALICIOUS

PDF

42.6 KB Created: 2020-08-27 00:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e50b8da5af0d8cb9e98507c43a7be904 SHA-1: 0c5e5eb63c57555b818b61ca28976b7604a26261 SHA-256: 50dc4becf159cfe7e8d035e4f737e7c634b3f7ebc0c8b0eee0a9d756ce09b02a
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.cc/pify?keyword=gemi+izleme+sitesink', is identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body appears to be corrupted or obfuscated, but the presence of the malicious redirector URL and the link farm strategy suggest a phishing or redirection attempt.

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=gemi+izleme+sitesink
    • http://files.lanasuomala.com/uploads/1/3/1/3/131398515/vopeka.pdf
    • http://fudaburif.ninawriter.com/uploads/1/3/1/6/131606345/rawuxudixituloweg.pdf
    • http://files.personalizedmindfulness.com/uploads/1/3/1/6/131606291/boxepeweg_fegepe_vutezimigug_gasavel.pdf
    • http://files.joysanchezphotography.com/uploads/1/3/1/1/131163507/ee031cb7e920e5.pdf
    • http://files.bonavitapt.com/uploads/1/3/2/7/132740377/fonofiberilopip-mikulorixejif-moropaf.pdf
    • https://cdn.shopify.com/s/files/1/0465/0709/8262/files/the_birds_1963_movie.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/function_of_buchholz_relay_in_transformer.pdf
    • https://cdn.shopify.com/s/files/1/0431/5086/8646/files/91518381765.pdf
    • https://cdn.shopify.com/s/files/1/0439/8333/9678/files/household_elf_badge.pdf
    • https://cdn.shopify.com/s/files/1/0440/7784/2584/files/lozaxap.pdf
    • https://cdn.shopify.com/s/files/1/0432/4153/7696/files/cefr_a2_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/1820/6887/files/din_en_iso_898_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9652/files/8374395514.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_off000065dc.bin
f6e7384a10e26be20537c2e1988be4ecdbfc510081c7ddc95cd4dabecd266677
pdf-font-stream PDF embedded font (sfnt) at offset 0x65DC 4668 bytes
font_01_sfnt_off000075c1.bin
2449d5c98c986640a572a9812b53e015b68065723643d3ece0474ca8d2f41291
pdf-font-stream PDF embedded font (sfnt) at offset 0x75C1 12408 bytes