Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d800a5960e4a5d…

MALICIOUS

PDF

41.4 KB Created: 2020-08-03 21:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d934633df1939045e14e563ffe341d96 SHA-1: d992e709eb42c042ec21d58587399a11a60efd5b SHA-256: 66d800a5960e4a5dd6d7979782fe641c5a673dc8f86b5ab9e593c62569ce3acb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple critical heuristics for containing a malicious redirector and a large link farm. The embedded URLs, particularly the one pointing to 'ttraff.ru', are highly suspicious and likely serve as a lure for further malicious activity. The ML classifier also strongly indicated maliciousness.

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=fundamentos+de+administra%25C3%25A7%25C3%25A3o+p%25C3%25BAblica+brasileira+torres+pdf
    • http://files.tolgardgames.com/uploads/1/3/1/4/131407357/mawutatamo.pdf
    • http://jovawi.chrisjoneswriting.com/uploads/1/3/1/3/131380058/zapiwuzesoti.pdf
    • http://files.bekinsmovingcompany.com/uploads/1/3/1/3/131381544/puximoselepuludisu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4023/4917/files/soni_vegas_pro_9.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/jixolezoxeditafowix.pdf
    • https://cdn.shopify.com/s/files/1/0428/5274/5375/files/repobokedegunifelo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9009713252.pdf
    • https://cdn.shopify.com/s/files/1/0431/9834/9471/files/48349823649.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/dazadomiro.pdf
    • https://cdn.shopify.com/s/files/1/0434/9932/3558/files/xatusokulo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4254/4533/files/kalivivosunevumufajutizov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/puneson.pdf
    • https://cdn.shopify.com/s/files/1/0438/2910/0704/files/47606956665.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_off00005990.bin
acda17147000cc577b9b0546c69b660b96c89f7744c5b947c65e66b77676681e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5990 6012 bytes
font_01_sfnt_off00006cda.bin
2ef88a950248ef993c9a753a05048441c6777ba8407b86fc7e39fa9e1389eaf8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDA 13972 bytes