Malicious PDF — malware analysis report

Static analysis result for SHA-256 137481c4e0331ba8…

MALICIOUS

PDF

69.1 KB Created: 2020-08-31 08:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7dd06d7b555a84ae38fedc35c20cbf98 SHA-1: 031a0b10a13e2465b607d26280712dc58ad706f2 SHA-256: 137481c4e0331ba8b742bc3738848c55663bdb303e876ad8a66a454dd00d22f3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by an ML classifier and contains a large number of embedded links, many of which point to external PDF files. One of these links, https://ttraff.ru/wix?keyword=where+to+find+larry+tupper, is known to redirect to malicious infrastructure. The document body itself is heavily obfuscated and contains what appears to be a URL, suggesting an attempt to lure users to malicious content or to manipulate search engine rankings.

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=where+to+find+larry+tupper
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_12eb73f1113a465d906497cf408704f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_550b66e1cead48ff8e3451b63a69ed27.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c7359982ed24ee2baf6faef56330ab3.pdf
    • https://cdn.shopify.com/s/files/1/0437/9181/0717/files/forex_technical_analysis_indicators.pdf
    • https://cdn.shopify.com/s/files/1/0435/7062/6723/files/83419426237.pdf
    • https://cdn.shopify.com/s/files/1/0454/0334/0968/files/befunky_editor_pro_apk.pdf
    • https://cdn.shopify.com/s/files/1/0430/8697/1029/files/makevakelodikagenu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6274/7548/files/wevarujowugo.pdf
    • https://static.usrfiles.com/ugd/b8c837_91d3b7603ce94cd786edf732d69ff3ea.pdf
    • https://static.usrfiles.com/ugd/bf0735_1ae9afa7a3fb4488ad0fda368794c8b4.pdf
    • https://static.usrfiles.com/ugd/e23fbb_de223709f03c4a259f2ceb4798f17d72.pdf
    • https://static.usrfiles.com/ugd/0ad6c7_c0f448fbbafb446cbaa28370e7eb9e34.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba607913a8904a358d37d38dc01a3227.pdf
    • https://static.usrfiles.com/ugd/b8c837_79014978337143ef8aa256f3ebac420b.pdf
    • https://static.usrfiles.com/ugd/b8c837_51b8d80f5e0c4e3890ca31c05e5452ec.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d217.bin
25353376c8f732e394550841c23c8754a6544a57e896fff86508e40362520b57
pdf-font-stream PDF embedded font (sfnt) at offset 0xD217 5068 bytes
font_01_sfnt_off0000e361.bin
9a1e55e956e120ce6687aad912eb0644818272d3dca045a43b19db70be2b1d0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 10652 bytes