Malicious PDF — malware analysis report

Static analysis result for SHA-256 3738605f15c556e9…

MALICIOUS

PDF

39.8 KB Created: 2020-08-29 23:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bc31dbb589ce3ed2cbc2ac62ebc1253 SHA-1: 2ae977d3d7885a1957b11835454a0bc22ec591ca SHA-256: 3738605f15c556e9688a5b39bb09ffff0a9021544cd40aba21e6db42fda029e7
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a technique often used for SEO poisoning or to distribute malicious content. One of the extracted URLs, https://ttraff.cc/wix?keyword=ancient+egypt+webquest+answer+key+6t, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but does include the malicious URL and other PDF links.

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.cc/wix?keyword=ancient+egypt+webquest+answer+key+6t
    • https://static.usrfiles.com/ugd/b8c837_ae35ed7916854a75a8d80562f6633295.pdf
    • https://static.usrfiles.com/ugd/b4a829_8e8a57ea26784076b2a26f42774f9c94.pdf
    • https://static.usrfiles.com/ugd/ca32a8_928d8563491e40998d88645bb0a767ca.pdf
    • https://static.usrfiles.com/ugd/432b07_b1dda454579640c78bec503c812e35c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f3915d817d241cca5973bb225ab508d.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8032/files/anti_mosquito_killer_sound_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/6822/7737/files/diwim.pdf
    • https://cdn.shopify.com/s/files/1/0440/7413/9813/files/download_cbt_nuggets_ccent_100-105.pdf
    • https://static.usrfiles.com/ugd/b8c837_dac20c1629db4edea42acf905b7e44bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e44dfcdddf743068bd2b82f37e58a53.pdf
    • https://static.usrfiles.com/ugd/b8c837_d05f0c953a8b45b883990788c19958dd.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9143/files/20689198483.pdf
    • https://cdn.shopify.com/s/files/1/0432/6231/2611/files/what_time_zone_is_indianapolis.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8994/files/23986346643.pdf
    • https://cdn.shopify.com/s/files/1/0429/0802/4985/files/tokutivugiwe.pdf
    • https://cdn.shopify.com/s/files/1/0435/3343/5032/files/60724285753.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_off00005c9c.bin
f2ef0803824ddb26040947bfec1b28e42faf624711dc837462b4a11654673418
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C9C 5736 bytes
font_01_sfnt_off00007047.bin
594af7f414a99271ec9bbaafb1ae4def0e1922978c9633ef09d2034dfdb639b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7047 9900 bytes