Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f023923c4a1b8b8…

MALICIOUS

PDF

48.2 KB Created: 2020-09-01 13:39:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7eaba878c624de83ea86c94dbb00d64 SHA-1: e312a7a585eca0c1c09faa0997e054bbbc1b4eaa SHA-256: 4f023923c4a1b8b8aac8fa1a3701c1868db2182df8bf4d904d8f5b29f53b53c0
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a mass external PDF link farm, with a primary malicious redirector URL embedded in the document body. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the text 'Pediatric head trauma ct decision guide' and the malicious URL, suggesting a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=pediatric+head+trauma+ct+decision+guide
    • https://cdn.shopify.com/s/files/1/0435/7269/1099/files/77249623309.pdf
    • https://cdn.shopify.com/s/files/1/0431/7747/6260/files/3096911052.pdf
    • https://cdn.shopify.com/s/files/1/0438/0668/7394/files/aeroplane_aerodynamics_structures_and_systems.pdf
    • https://cdn.shopify.com/s/files/1/0434/6544/1430/files/fijugudifewibulabafejeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/8558/5820/files/jovuxowujivuju.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/vafijuwexivuguk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9092/0099/files/lexuvutifizinizibisidoxon.pdf
    • https://cdn.shopify.com/s/files/1/0437/0307/4971/files/96938675557.pdf
    • https://cdn.shopify.com/s/files/1/0461/2148/4452/files/11869939987.pdf
    • https://cdn.shopify.com/s/files/1/0432/0631/2098/files/kokasulisuruloj.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_off00007e65.bin
60ff9a584d749d62b6cbe215b4f9a25e0d009a20a340ef21d4467c371d80da9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E65 5324 bytes
font_01_sfnt_off0000904f.bin
f9c2e6a65ea74404b20d7a73c04cf0a938b48633e16cd3545c67dd0d87b2ad1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x904F 10420 bytes

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