Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a5869ddb6f2785…

MALICIOUS

PDF

70.5 KB Created: 2020-08-07 09:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83d5698aa399291855d88c1756355e7f SHA-1: 041ee8d8db1cf3104108d804e33d64621b89289d SHA-256: 09a5869ddb6f2785178c70cd66f6da51596830a5eeda182af44d201fa840afcb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links to other PDF files, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://ttraff.ru/pify?keyword=nbc+bearing+pdf+file', is identified as a known malicious redirector. This indicates an attempt to lure users to malicious infrastructure, likely for further exploitation or phishing.

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=nbc+bearing+pdf+file
    • http://files.gokellyandco.com/uploads/1/3/0/7/130775134/juvemoxazatinazogor.pdf
    • http://files.candleandbodyshop.com/uploads/1/3/2/7/132741334/4150313.pdf
    • http://files.silverlakebarroncounty.com/uploads/1/3/2/6/132695543/fubavixiruw.pdf
    • http://files.coolstuffmontana.com/uploads/1/3/2/6/132682829/tuwog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/55815088097.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/mozizawelasaxi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0904/7717/files/7522846567.pdf
    • https://cdn.shopify.com/s/files/1/0439/0017/4504/files/somisufeto.pdf
    • https://cdn.shopify.com/s/files/1/0439/2943/6315/files/git_checkout_remote_branch.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/58675597497.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/abscesso_hepatico_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0431/9435/1778/files/19185294583.pdf
    • https://cdn.shopify.com/s/files/1/0437/8466/7297/files/wopefosevejoxuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/6519/6197/files/vizilupefodubazaga.pdf
    • https://cdn.shopify.com/s/files/1/0431/6528/6549/files/breath_of_the_wild_enemies.pdf
    • https://cdn.shopify.com/s/files/1/0437/9443/2161/files/kofenasirilato.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_off0000d823.bin
c72e7908d2fd86f6328093583a35a626ed376f7516d33592ce31fcd0fcfa8832
pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 5252 bytes
font_01_sfnt_off0000ea15.bin
ecbbacc70b9a732a4a59086b305a8c7e7a6797ea904fb1c125f0f49c70e2f8b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA15 10208 bytes