Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e7ad5eaf1f9fbb…

MALICIOUS

PDF

43.1 KB Created: 2020-08-01 22:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c06b91996debeb9093d6d604b05e39a SHA-1: 404cb8bb326d412b06c4e046aa6cd0ada5e5df08 SHA-256: 36e7ad5eaf1f9fbb24d6d970e7897db54f2d0e7fca2b333f6d00eddcdbfd1401
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'pt cruiser repair manual pdf'. The ML classifier strongly flagged this PDF as malicious. The primary attack vector is likely a phishing attempt using a seemingly innocuous document to trick users into visiting a malicious URL.

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=pt+cruiser+repair+manual+pdf
    • http://files.artsabella.com/uploads/1/3/2/7/132710791/6813027.pdf
    • http://files.flexitunnel.co.nz/uploads/1/3/1/3/131381363/zakorapafalul-wukarenabilipet.pdf
    • http://files.yslab.org/uploads/1/3/2/7/132740541/dezimojunuxekuwumavo.pdf
    • http://files.artsabella.com/uploads/1/3/2/7/132710791/681302
    • https://cdn.shopify.com/s/files/1/0434/0364/0984/files/68849622794.pdf
    • https://cdn.shopify.com/s/files/1/0438/0635/9713/files/burexefaraso.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bararilisubolubudikolumo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7186/3961/files/81683530836.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42257023754.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20880330559.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7992/files/53766006400.pdf
    • https://cdn.shopify.com/s/files/1/0429/1438/1980/files/resopevebimoferurizumu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7729/5521/files/73995391534.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/newefulibo.pdf
    • https://cdn.shopify.com/s/files/1/0438/0078/9154/files/xazoziwoniziwaxaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/8648/6440/files/58452203269.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_off00006a11.bin
d3795e4ac4f9d20decd25baa68aad5d4cfec82f2402aea451b5ecca7f2b7ce74
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A11 5300 bytes
font_01_sfnt_off00007c01.bin
8d0dcfc96a0183b2294604b555fee2c7ab424bead01d88671289fd5309892940
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C01 10304 bytes