Malicious PDF — malware analysis report

Static analysis result for SHA-256 8220419404bfacb9…

MALICIOUS

PDF

47.6 KB Created: 2020-07-30 09:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 648a7bf06104e6b7200ec4074b65897b SHA-1: 3e8c58c52e43f825e6ea1ea11e472865b70e3a2c SHA-256: 8220419404bfacb9a24309c30b788956a8c4f74103fce81391d0f3daa14978aa
154 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to a known malicious redirector, indicating an attempt to lead users to harmful content. The presence of a large number of external PDF links suggests a link farm, often used for SEO manipulation or to distribute malicious files. The ML classifier also strongly indicated maliciousness.

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=impacto+de+las+reformas+borbonicas+pdf
    • http://files.allycole.com/uploads/1/3/0/7/130739379/mukuxafelewabaj.pdf
    • http://files.sergeseiden.com/uploads/1/3/2/6/132683135/nixenarapoku.pdf
    • http://files.sikkimdiscovery.com/uploads/1/3/1/3/131384468/4892416.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9050/1020/files/lejagamelozu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4293/0842/files/vevizefobakilojejune.pdf
    • https://cdn.shopify.com/s/files/1/0432/7895/8758/files/17912846976.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/7228117665.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/63974127275.pdf
    • https://cdn.shopify.com/s/files/1/0434/6737/4758/files/joxevikakedudokanodimu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2297/files/85186392749.pdf
    • https://cdn.shopify.com/s/files/1/0438/3503/1712/files/48784707173.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/74218920777.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/rusubelukifevejafimexeko.pdf
    • https://cdn.shopify.com/s/files/1/0434/0757/3157/files/26260716896.pdf
    • https://cdn.shopify.com/s/files/1/0436/3714/5753/files/90944831531.pdf
    • https://cdn.shopify.com/s/files/1/0434/4233/9992/files/21624475401.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_off00007ac0.bin
ba64706348d022034b5ebc51b1d3e3856b54bc057d6ce620de5bcb0d00c88b27
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC0 5168 bytes
font_01_sfnt_off00008c20.bin
c6a0b17cd2116a55fb86d6c69f711e543201ada76ff6d449311b0199712508ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C20 10824 bytes