Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd1f068832ea46f…

MALICIOUS

PDF

40.0 KB Created: 2020-08-18 22:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd9a11329b0554289347dbcc297d304a SHA-1: 878dfb68ea7c0d264a9ff9801a314c44992e793a SHA-256: 9cd1f068832ea46f8f79ba1b9fdc4db8b211a87772385cc742f9e08efe00eca4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector at 'https://ttraff.com/pify?keyword=grade+2+english+worksheets+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to disguise malicious activity as educational content. The ML classifier strongly indicated maliciousness, supporting the presence of a redirector designed to lead users to further 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.com/pify?keyword=grade+2+english+worksheets+pdf
    • http://files.petshop.studio/uploads/1/3/1/8/131857540/relirozomi.pdf
    • http://files.uselessbayknits.com/uploads/1/3/1/6/131606789/9160353.pdf
    • http://files.genuinelyjoyful.com/uploads/1/3/1/8/131856232/1d2e147.pdf
    • http://terira.phillipsexton.com/uploads/1/3/1/3/131380344/a2537cd8e4c3b.pdf
    • http://files.southaustraliancavyclub.com/uploads/1/3/1/6/131606159/3f35671d9.pdf
    • https://cdn.shopify.com/s/files/1/0430/8851/1125/files/60588112339.pdf
    • https://cdn.shopify.com/s/files/1/0434/4381/4560/files/3622567216.pdf
    • https://cdn.shopify.com/s/files/1/0433/4750/9416/files/gipijojugalekol.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4695/files/sajuzoridokujopibopi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6766/0706/files/7578603005.pdf
    • https://cdn.shopify.com/s/files/1/0431/1675/7153/files/55229594018.pdf
    • https://cdn.shopify.com/s/files/1/0438/4597/6221/files/19107247867.pdf
    • https://cdn.shopify.com/s/files/1/0436/2888/8217/files/78012713042.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/xubifi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5129/3599/files/31541470245.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dbd.bin
2ca6465f04a64384b65a36a4d9e2da6a16f37c22171a998467fe249de307785e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBD 5624 bytes
font_01_sfnt_off000070f7.bin
19734ef8c0a4718d0f7c84034ee6cac7f47d6e7635acd78088349304ae9d74b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x70F7 10056 bytes