Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eec762b3dbb483a…

MALICIOUS

PDF

54.3 KB Created: 2020-08-09 04:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 319cd2aecb49c86e38e73128acfa2292 SHA-1: 8b62aa1de083a5548f51e6cc3216a90299804f27 SHA-256: 4eec762b3dbb483ac1bf1a7c446ab31370f827584705536bf270ba17f3484206
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=clasificacion+taxonomica+de+los+seres+vivos+pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the redirector URL and other URLs hosted on Shopify and various unknown domains, suggesting a coordinated effort to distribute malicious content through seemingly benign PDF files.

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=clasificacion+taxonomica+de+los+seres+vivos+pdf
    • http://getenaw.hillenhomestead.com/uploads/1/3/0/7/130740522/3428634.pdf
    • http://files.ocalametaldetectingclub.com/uploads/1/3/1/8/131856723/zavurapewe-jizobozulex-vivizifa.pdf
    • http://files.nikschulwitzarchitect.com/uploads/1/3/1/4/131453432/xadutuk.pdf
    • http://files.reainfocus.com/uploads/1/3/0/7/130775009/a17163e.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/zutilexusikiziv.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2155/files/rewisodijiwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9015/7474/files/17153849223.pdf
    • https://cdn.shopify.com/s/files/1/0434/1458/5509/files/pdf_to_dwg_converter_with_layers_free_download_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0437/1080/8216/files/9555010418.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/17721531589.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruwisosipopiwusanitilowaz.pdf
    • https://cdn.shopify.com/s/files/1/0438/2624/9885/files/22497826808.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/30154173559.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8487/files/joguwonug.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/fafotuzog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/memew.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58829080427.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_off00008cc0.bin
53543cdd34c4e5c1b9450e0aa9293e3fdc502ac33a6c2ed2b94b62d1b5264bb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC0 5336 bytes
font_01_sfnt_off00009ed2.bin
0d6dc86ca511e51207c28ffeb8cdd433e1b7f4d8efe230a58e1edbd41603b1e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ED2 14836 bytes

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