Malicious PDF — malware analysis report

Static analysis result for SHA-256 87493c2176d4d340…

MALICIOUS

PDF

35.4 KB Created: 2020-08-07 05:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae962f12e0d4e079b0fd6af0ed8a819f SHA-1: e77be5f96ee1306a5c8d137222ce72aa0a580eeb SHA-256: 87493c2176d4d3408ffc9e23dc9b060c72a8b022e29ff4b6ff5d02df39f6ffb5
158 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'Almanach 2020 pdf' and a URL that appears to be a lure. The embedded JavaScript and the presence of multiple external links suggest an attempt to redirect the user to malicious sites, likely for further exploitation or phishing. The ML classifier strongly supports the malicious nature of this PDF.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=almanach+2020+pdf
    • http://files.smithsolarlab.com/uploads/1/3/1/3/131381605/71b6ebe93d39.pdf
    • http://mosupod.newtonhillckd.co.uk/uploads/1/3/1/6/131636725/gijusitixo.pdf
    • http://files.chenowethbairddesign.com/uploads/1/3/1/8/131871894/kawal_fudomur.pdf
    • http://files.rockymountainjackpotshowseries.com/uploads/1/3/1/0/131070112/da88b34310b9.pdf
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/95432261788.pdf
    • https://cdn.shopify.com/s/files/1/0432/8659/3694/files/xusabape.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7431/files/operatoria_dental_barrancos_4ta_edicion.pdf
    • https://cdn.shopify.com/s/files/1/0437/2129/3974/files/18654255388.pdf
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/tebemokerumapi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1320/9246/files/boposi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/67573518990.pdf
    • https://cdn.shopify.com/s/files/1/0428/8043/4342/files/23260162716.pdf
    • https://cdn.shopify.com/s/files/1/0429/0147/1388/files/9502687915.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/63163838944.pdf
    • https://cdn.shopify.com/s/files/1/0433/7811/4727/files/86119307176.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_off00004af0.bin
5ae3774d3e0192bd92275fc30f01d73947f4b7f610510ad0368ab79747bb4b4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AF0 5384 bytes
font_01_sfnt_off00005d1e.bin
a3a75c7a83bc827f84910ffec170aae5e229473e5f50e18e7d6a92fdf0b2f04c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1E 10588 bytes