Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d24b5eae94329b1…

MALICIOUS

PDF

49.5 KB Created: 2020-08-10 06:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e107a2a6f8e1dbd2509da244aa25db34 SHA-1: 334b68b02a75c81e775121fde412bfd02d73ff12 SHA-256: 1d24b5eae94329b1911f6443a759bce5d8633d665d11f53459cb65b4b989eb96
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used to redirect users to malicious sites or to host further malware. One of the embedded URLs, 'https://ttraff.ru/pify?keyword=bituminous+concrete+pavement+pdf', is identified as a known malicious redirector. The presence of a large number of links, many pointing to Shopify domains with numeric slugs, suggests a link farm designed to manipulate search engine results or distribute malicious content. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

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.ru/pify?keyword=bituminous+concrete+pavement+pdf
    • http://files.vividdove.com/uploads/1/3/1/6/131637853/7389365.pdf
    • http://files.africaep.org/uploads/1/3/1/3/131383657/tubuzuv-bomanutik-zeziroguxowo.pdf
    • http://waledaxol.sweatshopmalta.com/uploads/1/3/0/8/130814168/01e1ce.pdf
    • https://cdn.shopify.com/s/files/1/0433/1284/0862/files/22566471050.pdf
    • https://cdn.shopify.com/s/files/1/0428/0349/5071/files/15990464413.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovetutokukike.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/nimapuxededajulozaxov.pdf
    • https://cdn.shopify.com/s/files/1/0433/3512/3102/files/wizowun.pdf
    • https://cdn.shopify.com/s/files/1/0429/1300/5724/files/advanced_analytics_with_spark_github.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8711/files/dirug.pdf
    • https://cdn.shopify.com/s/files/1/0431/7085/7122/files/valutigopeliwogaraw.pdf
    • https://cdn.shopify.com/s/files/1/0432/9956/9832/files/95273702466.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_off0000840c.bin
db8a3fd565406e6638e8fa8168e7dd421116ed96aca2679643db033588f9a518
pdf-font-stream PDF embedded font (sfnt) at offset 0x840C 5376 bytes
font_01_sfnt_off0000964a.bin
c5df79b395eabf2137002e3a383847c3790fc5c86678fd87d23b2a233912b822
pdf-font-stream PDF embedded font (sfnt) at offset 0x964A 10292 bytes