Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f34d3b9a211008b…

MALICIOUS

PDF

73.8 KB Created: 2020-08-21 19:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2323677b1dcc5dde3f74e0e0bc1c28c SHA-1: 118cf74cb972621072d428f4968de4426b005775 SHA-256: 9f34d3b9a211008bfd8251d033bc774e42f6cec70282350848328097427a7fa3
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to containing numerous external links, including one pointing to a known malicious redirector. The document body contains obfuscated text and a URL that appears to be part of a link farm. The primary attack pattern involves luring users to malicious sites via these links.

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.com/pify?keyword=vba+dim+as+worksheet+name
    • http://sevape.quantumae.net/uploads/1/3/1/0/131070792/juxemago.pdf
    • http://volotozep.coachscottschemistry.com/uploads/1/3/2/6/132682787/kurasaxutasaxaturun.pdf
    • http://files.academiadeballetallegro.com/uploads/1/3/1/6/131637016/7cbb3396054b1.pdf
    • http://zofaza.cactusgems.com/uploads/1/3/2/6/132682076/dokesoja_kalebu_rowolofanajun_mogixebuwuxot.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4751/files/oxford_phonics_world_1_student_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/xufefejizijizepijegex.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/tejasugiziwaxiwelifugo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6237/files/larubosixuvufidoxovelavol.pdf
    • https://cdn.shopify.com/s/files/1/0429/3738/5123/files/abound_abbott.pdf
    • https://cdn.shopify.com/s/files/1/0433/5609/4614/files/behavioral_approach_to_asset_pricing.pdf
    • https://cdn.shopify.com/s/files/1/0429/3869/5846/files/dixovuzixaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/1002/2814/files/guidecraft_step_stool_for_toddler.pdf
    • https://cdn.shopify.com/s/files/1/0433/9243/4343/files/vovodizedovup.pdf
    • https://cdn.shopify.com/s/files/1/0433/1791/9909/files/86965264744.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_off0000dbcb.bin
eaa0fc9d27e48daac5f149f2740eebcda588747e9bdcdf96aa0b0dfad7f3bdd5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 5292 bytes
font_01_sfnt_off0000edb9.bin
d207eaccc88c6749486ea1d13caacc25025f7487989d393594f0f5bc4cda473e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 14092 bytes