Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d47780aad53bc5…

MALICIOUS

PDF

34.4 KB Created: 2020-08-07 16:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a9278cfc520a8f5d22165b9e89a18c6 SHA-1: 76c2e6da0f117956622070d6c142a3e5adf9ac57 SHA-256: 12d47780aad53bc587f4b22f459a806176b1d6d925752dcddab2cf5d58cd13a2
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 are hosted on Shopify but appear to be part of a link farm designed to obscure malicious redirectors. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that further supports the link farm and redirection attack pattern. No scripts were extracted, but the presence of numerous links suggests an attempt to lead users to malicious sites.

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.cc/wb?keyword=acoustasonic%2040%20manual
    • http://files.movingstarzpub.com/uploads/1/3/1/4/131406440/simazukakisox_birelop_jivupo.pdf
    • http://files.sansurising.com/uploads/1/3/2/8/132814219/pajadumi.pdf
    • http://kaginax.listensoundart.co.uk/uploads/1/3/1/1/131164250/kenaga-bimovura-pibajozapa.pdf
    • http://fidula.birthingbaby.com/uploads/1/3/0/7/130776483/roragu.pdf
    • http://files.homelessradiomagic.com/uploads/1/3/1/4/131483343/wopodujanajod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/xujamalafawaxur.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/19256729790.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41718344304.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/gesiduz.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/tofewikowofov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gomejalubewetilukifij.pdf
    • https://cdn.shopify.com/s/files/1/0437/2804/4193/files/php_soap_client.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4408/files/gorerufupe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5209/files/55893782011.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/sanusas.pdf
    • https://cdn.shopify.com/s/files/1/0437/5746/9845/files/64692099860.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_off00004aa6.bin
5870321c2e230302d40dae5c4afdfde5459191ffb362b0cda08067cfa6ce4deb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AA6 5068 bytes
font_01_sfnt_off00005bd8.bin
168cf87581be385d1c5b56823e5581d10485845d69e449456396f1128e86b471		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD8 9732 bytes

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