Malicious PDF — malware analysis report

Static analysis result for SHA-256 729745dfae2ec40e…

MALICIOUS

PDF

43.4 KB Created: 2020-08-11 16:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24b9c58391a72379b9847468652116f9 SHA-1: 29d45bb2a02ddc2dfb4b8c2b43534cc92215a77a SHA-256: 729745dfae2ec40ef49b26e1b7e50b3c0f0726bbaf6b486fa86ecf226286afa7
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to what appears to be a link farm designed to drive traffic to a malicious redirector. The primary malicious link identified is https://ttraff.cc/wb?keyword=organic%20fertilizer%20vs%20chemical%20fertilizer%20pdf, which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content under the guise of providing a PDF document.

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=organic%20fertilizer%20vs%20chemical%20fertilizer%20pdf
    • http://revoxulin.southwestconferencescores.com/uploads/1/3/1/3/131380005/bozazomis.pdf
    • http://files.vanvalkenburgbuilders.com/uploads/1/3/0/8/130813111/3204594.pdf
    • http://files.chrisanthicouture.com/uploads/1/3/2/3/132303024/1450266.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4893/4295/files/wexujidixojetero.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9141/files/rifilalafufe.pdf
    • https://cdn.shopify.com/s/files/1/0441/0530/2168/files/student_mark_sheet_in_excel.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/nuzoniwosarigut.pdf
    • https://cdn.shopify.com/s/files/1/0438/9135/9899/files/54641321628.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8577/files/nepejuwikipexizaxalipa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/56551559247.pdf
    • https://cdn.shopify.com/s/files/1/0440/7705/6165/files/97613839013.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/gogudozedukinowod.pdf
    • https://cdn.shopify.com/s/files/1/0437/8198/0321/files/create_a_branch_terminal.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5262/files/xefataj.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_off00006864.bin
42f2b5254bf035eac8ca6805e29d9ba2e1cb8c9dc09e867d3968d7eb11c2cff0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6864 5704 bytes
font_01_sfnt_off00007bb1.bin
f853c6eb00cab29e39fbc1256bf74e6d539c8783650210df0f076bca18d58aea
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB1 10864 bytes