Malicious PDF — malware analysis report

Static analysis result for SHA-256 1802ea870114f140…

MALICIOUS

PDF

46.6 KB Created: 2020-08-01 17:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c519379fd6578237f8361456f0f18d5 SHA-1: be994fcd8deb23e5c719e5e0b36c3c176012ca54 SHA-256: 1802ea870114f1400fba6a8666977f2d8cf54c158aea8f0cbc8b75a2a87d3c6e
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 potentially malicious sites, as indicated by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external links suggests an attempt to lead the user to a malicious resource, likely for further exploitation or phishing.

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=sample+in+a+jar
    • http://files.davideweed.com/uploads/1/3/2/7/132740327/nevotiwowi.pdf
    • http://files.itswhereyoubelong.com/uploads/1/3/2/6/132695258/besowinufezelejo.pdf
    • http://files.spotlightseniorserviceslasvegas.com/uploads/1/3/0/8/130814283/1811894.pdf
    • http://files.betsyrose.org/uploads/1/3/0/7/130775261/givowa_sovubavisu_gebumu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0090/5373/files/2007_vw_jetta_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9862/0569/files/35344662152.pdf
    • https://cdn.shopify.com/s/files/1/0440/3570/2949/files/zopaworodumalupiwemefag.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/zamuteb.pdf
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/sezofaxojetur.pdf
    • https://cdn.shopify.com/s/files/1/0434/5593/8725/files/dagipural.pdf
    • https://cdn.shopify.com/s/files/1/0432/8475/8696/files/2143229439.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/delabukobudeseboju.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/rajeruf.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/kunamujogebokit.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8242/files/bezifemulejeg.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_off000079e1.bin
eb4fc7dee3a263b72c2e009a16b91cfc8cc78ec055728a28e22557034cabd4f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x79E1 4968 bytes
font_01_sfnt_off00008aad.bin
b18640c2098c2e1a79eb45a5e663eb0dbb58f1d8d78dc825fcfd4c3428711c5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AAD 10408 bytes