Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a90bea10a71613…

MALICIOUS

PDF

43.4 KB Created: 2020-08-31 03:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f275285fb0d2098de9defc91bb13d8e SHA-1: 8198cf129b71bb41de2731028e31695f3420021b SHA-256: 27a90bea10a7161390a236305c4ce2c9994ab57dc86b098172dee9da72c1931e
152 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to "Reader's Digest Merry Christmas Songbook" and the malicious URL. The presence of a large number of external PDF links indicates a link farm, a common tactic for SEO poisoning or distributing malicious content.

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/wix?keyword=reader+s+digest+merry+christmas+songbook
    • https://cdn.shopify.com/s/files/1/0435/4772/1882/files/zulezenazofareniva.pdf
    • https://cdn.shopify.com/s/files/1/0463/3414/8763/files/66382614427.pdf
    • https://cdn.shopify.com/s/files/1/0440/7758/0453/files/pivafoxepekavi.pdf
    • https://cdn.shopify.com/s/files/1/0440/7332/0600/files/xuwowawejokosojamimonuwe.pdf
    • https://cdn.shopify.com/s/files/1/0434/2372/7783/files/arsenio_lupin_espaol.pdf
    • https://static.usrfiles.com/ugd/455f95_bbe5f91ef86d4567af9c5c367bee6c05.pdf
    • https://static.usrfiles.com/ugd/5b9a87_17f397f701304044880dad7fbcbf01e1.pdf
    • https://static.usrfiles.com/ugd/0a593f_c201baf35c854ccd863b3650671bde09.pdf
    • https://static.usrfiles.com/ugd/b8c837_e35fb9174f764b579e129f622a8f2444.pdf
    • https://static.usrfiles.com/ugd/07e02c_3cdc175a3f624d3aa287544e614d9f36.pdf
    • https://static.usrfiles.com/ugd/432b07_8df4e984a44e4e13822ab980ce24764a.pdf
    • https://static.usrfiles.com/ugd/cfa91a_4d81833ecd88434f8418349bff4852c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a4c71da2b7344d285032b6f52991236.pdf
    • https://static.usrfiles.com/ugd/b98abb_fbdc0b5e5a4b4ea1a95abc5060361385.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c10aad2fbc846258c93f6f9b85cf4f6.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_off00006976.bin
e10a5ac61a211a1096d3c312f15651a44a71430f4be30a57aef7a8c29166aeed
pdf-font-stream PDF embedded font (sfnt) at offset 0x6976 5632 bytes
font_01_sfnt_off00007c83.bin
b645e3ad1d056c97eb5fbdaef189639bb1065cf4ba526d5283cb99fb19c60fe9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C83 10596 bytes