Malicious PDF — malware analysis report

Static analysis result for SHA-256 e819652c8e98f704…

MALICIOUS

PDF

40.3 KB Created: 2020-08-14 23:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23ea97d173bfc61417c926cb500d3cc0 SHA-1: 1d7b2f7fe9c1111b10f3693bd97c11b420958d3b SHA-256: e819652c8e98f704da36968de4e258ae4e8b7d656076e78fa00e264adc924c20
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users into clicking through to potentially harmful content. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent. The presence of a large number of external PDF links, many pointing to Shopify, suggests a link farm or SEO poisoning attempt to mask the malicious redirector.

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=agency+cost+in+financial+management+pdf
    • http://files.vucatools.net/uploads/1/3/1/3/131378816/2e95602e0f761.pdf
    • http://xoramed.redhoglures.com/uploads/1/3/1/0/131070858/a33ac242b.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/ksb_centrifugal_pump_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0437/2781/4810/files/virology_definition.pdf
    • https://cdn.shopify.com/s/files/1/0430/8280/9508/files/matexudegowatedejumixa.pdf
    • https://cdn.shopify.com/s/files/1/0428/5743/1196/files/retrieve_textfield_from_using_itextsharp.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/application_letter_sample_for_any_vacant_position.pdf
    • https://cdn.shopify.com/s/files/1/0430/9218/1153/files/93341872869.pdf
    • https://cdn.shopify.com/s/files/1/0440/7279/6325/files/52891855771.pdf
    • https://cdn.shopify.com/s/files/1/0432/3275/5875/files/56206195960.pdf
    • https://cdn.shopify.com/s/files/1/0434/2136/8482/files/wijixagabatixobipanofif.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/52977267683.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_off0000609b.bin
c6309c0e0539935c231cac7dcc5a94f448be1e17f7655e005ab7109d5ae7e9c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x609B 5472 bytes
font_01_sfnt_off0000732f.bin
b5ece996e3d55bf8d7d38393983014467ee56dca0f8c665280394b8117085159
pdf-font-stream PDF embedded font (sfnt) at offset 0x732F 9840 bytes