Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d3c1b34d4d3d5a…

MALICIOUS

PDF

38.2 KB Created: 2020-08-05 11:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eddf4098651f565103b8a5ce609d68d5 SHA-1: 63eea02daa78443c9c59896a1c1b06112b676d0e SHA-256: 34d3c1b34d4d3d5a983cbceb3b85255cb0363505d2b36ab58996d0ac82bcab7f
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of links and the presence of a malicious redirector strongly suggest an intent to lead users to harmful content.

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/wb?keyword=talmy%20toward%20a%20cognitive%20semantics%20pdf
    • http://files.atxcandlecompany.com/uploads/1/3/0/8/130813667/decf2fbada3ef.pdf
    • http://fitorim.michellecobbin.co.uk/uploads/1/3/0/7/130739678/nuwak.pdf
    • http://files.imablumm.com/uploads/1/3/0/8/130874115/6414065.pdf
    • https://cdn.shopify.com/s/files/1/0432/5628/3296/files/60846707068.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7296/files/vexelivuxigev.pdf
    • https://cdn.shopify.com/s/files/1/0428/3367/4396/files/nizilakekituxararopowu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8415/1974/files/dodge_ram_parts_diagram_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/14981909947.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7562/files/mavojiruj.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/7079890992.pdf
    • https://cdn.shopify.com/s/files/1/0448/7023/8370/files/activity_series_of_elements.pdf
    • https://cdn.shopify.com/s/files/1/0435/5312/8612/files/18009888987.pdf
    • https://cdn.shopify.com/s/files/1/0440/4091/3046/files/96765640651.pdf
    • https://cdn.shopify.com/s/files/1/0428/0126/6851/files/84351544497.pdf
    • https://cdn.shopify.com/s/files/1/0430/8402/1921/files/casio_g_shock_watch_manual.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_off00005669.bin
2b3cdbb40f9ab64713312519e7da1945556b36746ad13198e382820d3c973c7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5669 5676 bytes
font_01_sfnt_off000069c5.bin
26b63f65fc9b74d6106f6698a5787e3e7eb4eac32cf7b014d40e7601c0971238
pdf-font-stream PDF embedded font (sfnt) at offset 0x69C5 10024 bytes