Malicious PDF — malware analysis report

Static analysis result for SHA-256 08de20470b0a2407…

MALICIOUS

PDF

44.2 KB Created: 2020-08-02 12:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c12a59f01535990ddc3a5ce76ae6fc57 SHA-1: 1a9b90a4154e09e80b7046d115d59aa5f37eb153 SHA-256: 08de20470b0a2407a615ee6996d26068ed1cf5fd98a3dd7c58b59c0794167c43
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure, specifically identified by the URL https://ttraff.ru/pify?keyword=are+free+vpn+safe. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests an attempt to drive traffic to potentially harmful sites, likely for phishing or scam purposes. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=are+free+vpn+safe
    • http://files.valleywestphotographyclub.org/uploads/1/3/1/1/131163902/nifakuxufatikodaxux.pdf
    • http://files.eathorpepollherefords.com/uploads/1/3/1/4/131437626/e4e521e336d.pdf
    • http://files.teagan-rose.com/uploads/1/3/0/7/130738554/kozudesijobigelafava.pdf
    • http://files.aromacatering.net/uploads/1/3/1/3/131398195/7141974.pdf
    • http://files.lorialbertdesigns.com/uploads/1/3/1/3/131384286/c0a8102dd3f9d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/lefaxanetogasanaketema.pdf
    • https://cdn.shopify.com/s/files/1/0438/6134/4406/files/85016072143.pdf
    • https://cdn.shopify.com/s/files/1/0431/2009/9488/files/89726449447.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/python_import_module.pdf
    • https://cdn.shopify.com/s/files/1/0429/2971/7407/files/74194644779.pdf
    • https://cdn.shopify.com/s/files/1/0435/4244/6229/files/wufife.pdf
    • https://cdn.shopify.com/s/files/1/0440/5359/4277/files/nirofizuduji.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/loduraxozu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9459/files/87681701362.pdf
    • https://cdn.shopify.com/s/files/1/0429/5062/3385/files/movalugedetogoxevoxubotiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/0599/3375/files/50881054535.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/50740755287.pdf
    • https://cdn.shopify.com/s/files/1/0429/7241/4106/files/56088433453.pdf
    • https://cdn.shopify.com/s/files/1/0434/4571/5109/files/pisagatus.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000701d.bin
80acee001605edd246bdba55f9e054166f89fd6c4ea7343cf080fec27f001149		 pdf-font-stream PDF embedded font (sfnt) at offset 0x701D 4912 bytes
font_01_sfnt_off000080ee.bin
6056eecbf5ec1cbdd44239bc63ea3e8ec9dbeafb89a479f19466d3ba066c02b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80EE 10272 bytes

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