Malicious PDF — malware analysis report

Static analysis result for SHA-256 6091e2eed2b3eaa4…

MALICIOUS

PDF

46.5 KB Created: 2020-07-30 14:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b842709b43c11ea853afe28cc09d9e4 SHA-1: 2417430ca680f290aea1cccd3819ae43551cf575 SHA-256: 6091e2eed2b3eaa4938c57a20e43d9a83c47580111a808cf535367c46bb91b82
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 link farms designed to redirect users to malicious sites. The primary malicious link identified is a redirector that uses a keyword related to Bible reading guides, suggesting a social engineering lure. The ML classifier strongly indicated maliciousness, and the PDF structure itself is suspicious due to the mass of external links.

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/pify?keyword=catholic+daily+bible+reading+guide+2020+pdf
    • http://files.yourschoollibrary.net/uploads/1/3/1/6/131637656/xikejurudujop-jowaz-vobewizu.pdf
    • http://files.globehopnow.com/uploads/1/3/0/8/130874050/kusiwokulibozi.pdf
    • http://files.empireplumber.com/uploads/1/3/1/6/131606393/dorosagozamemixim.pdf
    • http://files.edibologyinfusions.com/uploads/1/3/1/4/131438211/vabedorere.pdf
    • http://files.nancyribi.ch/uploads/1/3/2/6/132681576/7305166.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1418/5372/files/mediguvukopafenovagupuxi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6169/8969/files/84502808761.pdf
    • https://cdn.shopify.com/s/files/1/0436/5202/2430/files/ninuzepuzaromasasexog.pdf
    • https://cdn.shopify.com/s/files/1/0431/3432/0794/files/97698159419.pdf
    • https://cdn.shopify.com/s/files/1/0437/8561/7570/files/lalonajilazoreripalaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/0675/3948/files/jerasokoxejo.pdf
    • https://cdn.shopify.com/s/files/1/0440/8236/4566/files/lakaduxumamamadoxute.pdf
    • https://cdn.shopify.com/s/files/1/0439/1777/0904/files/giboxawuge.pdf
    • https://cdn.shopify.com/s/files/1/0438/3483/5094/files/zuroraruxapamazave.pdf
    • https://cdn.shopify.com/s/files/1/0432/7197/9171/files/fawokibaf.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_off00007368.bin
8b59bdfa21b1db863fac180471ab683b2884e9809391eb01a2f9d28ea0e4ca1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7368 5660 bytes
font_01_sfnt_off000086af.bin
8676753e59d9fcaca94220ed896c6e54fb057056f4cb5afe1cd8505ff918bdfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x86AF 11324 bytes